I just used (for maybe the 3rd time/3rd visit since I downloaded a few years ago) the National Zoo app this past weekend. It did exactly what I needed it to: showed me where the closest bathroom was (blue dot for me) and showed me when & where the animals were getting fed that day. Nothing fancy.
I have also used the Magic Tate Ball app multiple times since download, but usually to show other #musetech folks what I think is so great about that app. (Maybe it is not so great if I never use it otherwise…)
I also have a folder labeled “Museum” with a couple of other museum apps that I never use. Not sure why I haven’t yet deleted them. Probably because they took eons to download (sorry ArtLens and YourArt).