We went to DW on July 4th one time and one time only. We were at MK that day and you couldn't hardly move. They have ropes in the middle of the walkways so that people walking one way wouldn't wonder over. This was to help keep the traffic flowing.
It was hot, but we actualy had a lot of fun, because everyone there was in this wonderful spirit. See the fireworks show on the 4th of July was spectacular and will give you goose bumps.
Have a great time.