I feel you have failed to understand the design of the exhibits

The entire intention behind the darkened and sterile design of the bird houses (and the reptile house, to a lesser extent) is to make the vibrant "world of the birds" pop to the visitors. This is something World of Birds has done for over 50 years.
I do agree that the ABH needs a facelift, but I'm not sure I'd even agree that the others are an issue from the visitor perspective. WOB has entire small rooms dedicated for educational displays (ie the "survival" room and the extinct bird memorial--the latter of which is actually under renovation right now) as well as displays about deforestation and the illegal wildlife trade throughout the building. There are also two walkthrough aviaries. Both WOB and WOR have windows into their nurseries. WOR has the "field station" display in the middle of the room, something I expect 99% of visitors ignore because there are no animals along that wall. The Mouse House I'm unsure what you would want to add. It's a pretty simple exhibit, just one hallway with displays on either side of the path, but half of it is a nocturnal exhibit. JW really confuses me. There are tons of non-animal displays throughout the building, and even it's pathways are more imaginative with wooden "bridges", views through waterfalls, and of course the bulk of the visitor space is through a massive walkthrough.
I 100% agree with you on the signage. The zoo lacks majorly in this department in general. World of Darkness has opened with amazing signage, and tbh I think it's a bit much with the touchscreens. Some other habitats such as the Dholes have great signage, too, but those laminated paper printouts fill their houses and lots of stuff is simply unsigned.
Signage aside, though, I'm curious what you'd want to see added to the hallways of these other exhibits. What are other zoos doing that Bronx is not? I honestly can't think of many zoos that do much different with the visitor spaces in-between habitats of their buildings that Bronx doesn't do. Sometimes the point of the zoo building can just be the animals.
~Thylo
As I said, my main issue is with the signage of these buildings. I agree, World of Darkness was an excellent step forward with this. One thing I like about World of Darkness's signage is that I felt it was pretty subdued in a typical Bronx style, but at the same time engaging and provided the information needed. I also think the touch screens are a great touch as they get kids (and adults) engaged with the signs, along with taking in information, and aren't extremely repetitive where you have to do the same thing on every sign (this is not something the Bronx has an issue with in general).
The rest is really going to come down to personal preference and admittedly likely isn't going to appeal to you if you found the touchscreens a "bit much." I understand these buildings really strive to put the focus on animals and overall, they are very successful in accomplishing that task with the excellent exhibits in them for the animals. Again, its mostly a signage thing. In the case of Jungleworld I agree, there is very little to be done in there, but I still don't care for the signage or think it is very good for the average visitor. A lot of people don't even appear to notice the signage in the handrails, especially in the areas that are not well lit. Otherwise, Jungleworld is a great example of what I would like to see done elsewhere in terms of most the other aspects and visitor immersion.
To go beyond that, I would like to see more of what has been done in World of Darkness in terms of the walls/ceilings to help create a more immersive atmosphere. It does not need to be anything major, but the cutouts on the ceilings, imitation of the night sky, etc. help immerse visitors in the experience. This could take the the form perhaps of murals in the bird houses, some rock work, plantings in the visitor areas, etc. These are all things the zoo does better than most others within the animal exhibits themselves and I think could be extended to the visitor area. A quite extreme version of this would be what Omaha has done within the Orangutan House with making the visitor area into a mock ruined temple. Again, this is extreme and I am not advocating for the zoo to go this far as I think that is too much and way overdone, but it helps make visitors feel immersed in exhibits.
I think your comment on the field station in World of Reptiles highlights a problem that is also found with the educational displays in World of Birds. They are off to the side and seem to be a complete afterthought in the zoo. I agree, many visitors will skip these areas because there are no animals, but they feel tucked off to the side in many cases and like visitors need to go searching for them if they want them. They don't draw attention to them when you need to in order to get visitors to engage with the information.
Mouse House is again, mostly a signage thing as, yes, you aren't going to do a ton in the nocturnal area. I actually think the signage in the non-nocturnal area is pretty good as it is, so would mostly like to see that expanded to the other side.
As I've stated recently elsewhere, the Bronx is a top level zoo and because of this I am perhaps holding them to a higher standard than most other zoos out there. Honestly, as I think about other zoos, I think many criticisms of the Bronx extend to other zoos as well. I think zoos as a whole could do a better job of engaging visitors with their informational displays and perhaps need to start looking at what other museums types are doing in this area. These areas get skipped over because they are uninteresting, not necessarily because visitors are uninterested themselves.
Perhaps, it would all be for not as yes, zoo visitors are most certainly there to see animals versus the informational "displays", but I don't think zoos in general do a very good job of getting visitors interested in these things to begin with. This is an ongoing conversation/reality teachers have had to deal with in the classroom as putting a wall of text in front of people does not engage them or get them interested. This is one of the reasons I would advocate for signage in the vein of World of Darkness when it comes to the animal signage. Its minimal and can be read quickly, but informative and has some aspects to get visitors engaged. What worked 50 years ago to engage visitors/students/learners does not work today.
Once again, to wrap it all up. Fixing the signage alone would go A LONG way for me and if that is the only thing that was changed, I would be perfectly fine with that. However, at the same time I think more can be done to truly immerse visitors.
EDITING to add: I think these are all things that absolutely could be done, while also focusing on opening a new exhibit area, but with the way WCS seems to sort of focus on one thing at time, I personally would prefer for them to focus on the signage first as opening a new area/bringing more animals into the zoo does not necessarily seem like it should be of the highest priority to me at a zoo that already has exceptional exhibits (for the most part) and a large collection of animals. I understand money is a large as to why new exhibits have not happened at the Bronx Zoo, but at the same time the fact that mostly everything there is still of a high quality makes that something that is not urgently in need of attention and not a focus for that very same reason.