Dude, college lectures. Having a notepad running to take notes in, have the recording going, be able to look back at the recording and the notes. That would be sick.

Screen actors seem to like theirs, so do screen writers, producers, casting agents...

The word I love is "star ball". My local museum has one of these. They're apparently difficult for upkeep, since they've been produced such low volume. There's only a handful of specialists who travel around the country servicing them.

There's actually a Wikipedia page [0] (no doubt lovingly curated by beautiful nerds) that has a long list of planetariums with Zeiss star projectors.

But there's still the problem of finding shows where they are actually used...

0: https://en.wikipedia.org/wiki/Zeiss_projector#List_of_planet...