We were at WDW from June 15-23. It was the normal summer crowd until around the 20th when it got JAMMED!!!! I could not believe the difference in the crowd size at all the parks. Luckily we already did everything we wanted and were re-riding some of the rides so we did not miss anything. As someone said, get to the park EARLY....before opening. The lines at the entrance start forming about 30 minutes or so before park opening. We found that if you go left in the Magic Kingdom you will find the areas very peaceful. We got to see Mickey's Philharmagic with about six other people on a Thursday morning and there were no lines at Big Thunder or Splash Mtn. However, when we tried Tommorwland first it was really crowded and we headed back to Frontierland where it was (again) quiet for the first couple of hours. Getting to the park early and using Fast Passes will get you through. Just make sure everyone drinks water at every opportunity. The heat can sneak up on you if you are not prepared.