You will often see them on the ride helping stuck cars, or if a kid can't reach the peddles (even though they meet the height requirement) they will ride along with the kid.
I'll hazard a guess on the airlift: They didn't want to have to manually carry the dude on a stretcher to an exit in front of all the guests. I'm guessing they got the CM down the utlidor and off to a place where a chopper could land without creating too big of a scene.