We went Labor Day Weekend last year and found the parks to be extremely manageable. Things were a little busy but not to the point of mass chaos and confusion like you see over Xmas or other busy holidays. If you had to choose a holiday to go, Labor Day is the one to pick. It was hot, so we would hit things in the morning and then get somewhere cool by afternoon, and then close down the parks after the sun went down. Late hours at MK were the best. After wishes and the parades were done the park started to empty out. We rode many rides multiple times and really enjoyed ourselves. I couldnt believe my 2 DD's made it to 3 AM. We even got one of our better family pictures with some of the Halloween stuff they already had out looking up Main Street with the castle in the background. There's hardly anyone else on the street in our picture. I would do it over again. My DW hated the heat though.