A few years ago we went from July 1st-12th. As a child and an adult, we have always gone over the summer so the heat didn't bother me. July 1st-3rd, the crowds were good. The 4th fireworks were INCREDIBLE!!!! I have never seen anything like it before. However, the crowds were horrendous! You literally could not walk because your nose would bump into someones back.

The fastpasses were all closed early in the day, and the lines were awful. MK had hit it's maximum capacity early, so people were not allowed in (unless you were a disney resort guest) We headed over to MGM, and it was just as bad. It seemed to stay very crowded thruoghout the rest of the week. Both waterprks had to stop admission because they were too crowed. We were lucky enough to be there at opening, but the crowds were overwhelming. The next time we went, it was the last week of June, until July 2nd. The crowds were bearable, nothing like on the 4th. The parks never hit their capacity, and we were gone before the 4th. We are going next year-June 22-July 1st. This time of year works well for us. It's still crowded but it's workable if you have a good plan. Even though the fireworks were great, I would never again go over the fourth. That's just MHO.