I read all of Camus' books I could get my hands on when I was twenty and backpacking for a couple of months around Europe. There was some "feeling" in his writings that I just could relate to.
I've often thought about this myth (especially when working a very repetitious job for many years) and although I could understand Camus' reasoning that Sisyphus could be happy in his absurd situation, I somehow always found it irrelevant because he would most definetely be more happy without it. But if Camus' point is that one can find a meaning to his life in any circumstances, then I agree and think that it's a vital point-of-view for my recovery.