Believe it or not, i enjoy going to WDW during the summer. Yeah it maybe be crowded and hot but it's enjoyable. Long lines don't matter when u go with friends... u goof off until you get on the ride, tell jokes and so on. I just love it!
I have always enjoyed the holiday time in the park(Thanksgiving -News Years). I think the park looks so good with its decorations. It's weird when you go back right after they are taken down, the parks just feels kinds of empty for a while.