Here's a rundown refresher:
There is the outdoor queue (as you approach the lobby of the hotel.)
Once you make the very short trip past the lobby area,
you are loaded as a group into a library room.
There is a (standing only) Pre-show in the Library.
Then, you exit into the boiler room (internal walk-through queue.)
After that, guests are boarded into their elevator cars and they remain in those seats all the way through to the end of the ride.
(I've been upstaged by some "mesa" guy.)