Disney, for the most part, has really mastered crowd control. I have been there several times during the summer, which is some of the most crowded times, and still the waits are not terrible. There are, of course, a couple of exceptions to this but still worth the trip. In my opinion, any time I get a chance to go to Disney it is worth it. Even if it means having to go back to the resort to change shirts half way through the day!