Well I don't have much to compare it with, I've always gone in July. And once in DEc.
....and you can't compare those two times of the year.
Well, if you plan right, and get the most popular rides out of the way before noon, you should be o.k. We always take it easy in the PM, we don't expect to get alot done. Sometimes we are pleasantly surprised!
The heat is a major factor in touring in July. You HAVE to take it easy in the PM, especially if you don't plan on going back to the resort in the afternoon for a swim or nap. We like to stay at the parks in the PM, so we take it easy and try to do many AC shows, eat a long lunch,shop, and watch the parade.
I'm sure you'll find the summer alot of fun. The atmosphere can't be beat. Plan your days, get up EARLY, and drink LOTS of water.
You'll have a blast!