As far as I know yes. From personal experience you can just `cd ..` your way out to the top parent directory and see all the orgs which use the system. I could see MIT and JPL(?) users from my cmu account and you can view the other users for each org (at least for MIT and for some of the other unis, I could never get the JPL stuff to load.) You can view the usernames and their public folder but nothing else.
There's also a lot of content from previous CMU classes. It was interesting to stumble upon some older 15151 course material which used some programming to prove certain theorems. They don't do this anymore (I'm not sure they even did this in the first place) and I'm assuming even for CMU CS students, expecting them to be able to programmatically prove theorems in a freshman class is a bit much. Cool stuff to root around in.