Summer is crowded at WDW. We go every year during August and have found the end of the month to be far less crowded than the beginning.
A crowded day at WDW beats a day anywhere else!
If it is crowded when you are there, just get to the parks early. You'll see more in the first two hours than you might for the next four if it is really crowded.
Judging by the times and number of Spectro showings I say Mich Mouse is on the money. Begining of August looks much more crowded then the end of August.
Crowded and HOT Strategy: Get up and get to parks early.
Take advantage of EMH. Drink lots of water. Take a nice long break from after lunch until after dinner, then return to parks.
The only problem with this is that you're staying up late and getting up early. That's why you need a nap