Yes, its funny the indoor 'dayroom' doesn't get discussed much- I think its actually very good though its size means it can't hold too many adults. I also like the fact it has plenty of natural daylight and is not gloomy like many indoor areas.
Agreed, they had also added wooden screens in the exhibit so the gorillas could hide behind them if they wish (I can't explain it clearly - the screens are in the exhibit, not on the glass...)
Not sure its there yet, but time seems to bring improvements to many newly built zoo enclosures. All they need to do at GK now is think 'some live trees is what we need now' and also maybe- 'lets get rid of that horrible fake tree and devise a simpler new access for the monkeys' then I think it could be getting really good....