I was REALLY lucky, I think. I wanted attractions, preferably something where I could talk and be a part of the attraction (e.g. Jungle Cruise) vs. just loading and unloading. I got the Great Movie Ride which was awesome!
At that time, the tour guides had a part where we got shot and had a fake blood patch on our shirt which we revealed as we fell down some stairs. So, not only did we get to narrate, we were part of the action! I understand that bit didn't last long due to the liability of $5/hour operations CM's doing stunts.
I think, no matter where you end up though, it is a very worthwhile and fun experience.