I decided to have another visit this afternoon and was surprised at how busy it was (although not holiday period/sunny weekend stupidly busy). Made my was straight to Chimp Eden and could barely get a few steps in from the Gorilla end before being blocked by pushchairs etc. The walkway really is too narrow, but probably no more so than most other exhibits of the same style. I'd arrived about 12:30 which is probably the peak of the day and as the afternoon went on, I did find it was quieter later on. At the moment, there doesn't appear to be any reading material, or signs along the walkway, which would make busy days unbearable.
Something that cheered me up was finding the Long Tailed Chinchilla had moved to one of the Ferret enclosures and both were out on view; maybe because they had only just moved and were making their mark. This is the first time I've actually seen them out.