I'm torn about some of these. Yes, I visit a lot of zoos, and yes, these features can be very repetitive. When I go to a new zoo, I'll often take only the briefest of glances at their giraffe feeding deck, or take a quick stroll through the kangaroo walkabout - and then spend twenty minutes in a crouch waiting for a bird that I've never seen before in the aviary to come into view. I get why a lot of this stuff might seem exhausting or uninteresting to folks on this forum.
A lot of people, however, don't go to a lot of zoos - maybe only a tiny number over the course of their life - and for them, these things that are boring or overdone are absolutely magical. I remember seeing a girl I went to high school with but hadn't spoken with in ten or fifteen years post pictures of a zoo where I worked at the time on her facebook page, pics of her and her kids in the 'roo walkthrough, and later feeding the giraffes, then the lorikeet aviary, and her mind was absolutely blown by the experience. She's never thought in a hundred years that she would do something like that. For me... it was a Tuesday at work.
Zoos repeat these experiences over and over because a) they work very well, being tried and true, b) they satisfy the vast majority of the public as great experiences. I'm always excited when I get to see something new and different that breaks the mold, but I acknowledge that the mold is there for a reason.