... and they DEFINITELY don't leave via a backstage entrance.
Now that I think back more carefully, even 25 yrs ago we did leave via the ferries, and our busses were at the MK lot in designated spaces, where the offsite resort shuttle busses normally pull in. We were not allowed to leave before sunup, though, and we had to meet at a designated spot in the park and walk out in a group with everyone accounted for, so I guess the exit procedure has changed a bit over the years.
I know we did go in through an alternate entrance, because they did a thorough bag check (the drinking age then was 18, so the point was to keep alcohol out of the MK.) It wasn't really what I would think of as backstage proper, I think it was a gate that was normally used as a fire evacuation route, on the Tomorrowland side somewhere. I don't think that the MK's bus loading area had been built yet.
Our trip was 2 nights. We left after school the day before, and got to the hotel with just enough time to change and head back out before the MK opened. We spent the day following the party at SeaWorld! Our school required that the trip have an "educational" component, so we went to SW, and we pretty much spent the entire day drinking, having had no sleep for 24 hours. I have pictures, but I don't think I was really conscious at the time. We spent the second evening at our hotel pool, ate a lot of pizza and drank yet more, and crawled back onto the busses in the morning, hungover, for the long drive home. Please forgive me if I got some of the procedural details wrong, it's a wonder I can now remember any details at all
