It's absolutely worth waiting in line, imho. DH loves Tower and I've done it twice, but the falling thing is not for me. I always go through the line and lobby, preshows, etc with him. When you get to the point where they ask "how many?" he says "one" and I say "one for the express, please." They always know what I mean and it makes it a little more discreet, if you care about that sort of thing.
Normally I don't, but that line came in handy when we took our nephews for the first time. We didn't want to freak them out, so I acted as if I were riding the whole time, then asked for the express when we got up to load. They questioned it for a minute, then DH told them I was going on a super-intense version of the ride for experts... an elevator with no seatbelts or anything! They bought it and asked me about my "expert ride" the whole rest of the trip, but neither would volunteer to do it with me the next time we went to Tower!