I don't know. I guess crowd levels don't really bother me that much. I mean, obviously, when it's slower, it's easier to navigate, but if you use fastpass wisely, and just stay out of certain sections of the Magic Kingdom at bad times, I never have a problem. I only say MK because it's the only park I ever find the crowds to be out of control at.
We were there in May, which is typically about as crowded as the end of August, and that was the kickoff of the 50th Birthday, and I didn't think crowds were that bad in the least. I don't think we waited more than 15 minutes for anything.