Speaking specifically to sound work, an experimental short I did with a friend last year heavily relied on the sound we created for it and we have to creatively use it. The end result was very cool and extremely satisfying to the both of us, but you have no idea how much of a pain in the ass it was to do in the first place.
Cable, if you need it proven to you that making a movie is something usually as frustrating as it is fun, I would challenge you to make a Star Wars fanfilm. It would involve a fair amount of initial effort to shoot and a fair amount of post-production sound work. If you do that and come back here saying you felt no frustration, I think we'd all shut up.