Okay, I've been down in August before a few times. Actually, I was down the last week of August last year. From what I understand, it can still be pretty busy in early to mid August, but when I've been the last week, it's practically empty and I've only had to wait over 30 minutes for an attraction once. What I will say is, if you don't like your temps in the mid to high 90s with a good amount of humidity, then maybe you should go a different time. On the plus side, there are plenty of air conditioned areas around, so you can always duck into shops and other attractions to cool off quickly. Also, if you go to a park in the morning and have some fun, you can head back to the hotel and hang out at the pool during the hottest part of the day, then go and hit another park at night. I just really like to go down then, mostly because of the lack of crowds. Alot of people will either have their kids back in school(Orlando goes back on August 9th this year) or getting ready to have their kids go back(first week of September). If you get your kids things together and ready for school before you go, then last week of August is great, in my opinion.