I'm pretty sure running the projector is the easiest it has ever been. There are no reels to corral, no real moving parts, nothing at all to confuse one. Well, at least I imagine so. It takes approximately zero skill.
Running the projector is the only part that actually happens in the cinema. There is no orchestra playing mood music. Some pimply fifteen-year-old hits a button (maybe two, if he also has to turn off the lights). That is all.
Perhaps if you have gone to the premiere, and the stars and director are actually in the audience, it is appropriate to applaud. But when the closest thing to Heath Ledger in the theatre is a Heath bar, applause is superfluous and weird.