Hmmm. I guess it depends on what type of group you have and how you tour.
Here is a recipe for a miserable trip in August:
1. Always arrive late to the parks each morning. The later the better.
2. Stay all afternoon at the parks when it is hottest out and the lines are longest.
3. Get in long one-hour lines in the afternoon like Peter Pan, Dumbo, Splash Mtn, etc. If possible get in lines that are exposed to the sun for most of the wait so it will really drain everyone and make them irritable.
4. Do not use FASTPASS. But if one does use FP do not learn any of the tips and tricks.
5. After everyone is hot and tired leave the parks late afternoon or early evening when everyone else is leaving.
I think your underlying question is if its possible to have a great trip in August. Definitely yes! We have done it several times.
Here is some advice to help folks enjoy summer visits:
"Getting The Most Out of a Summer Visit To DLR"
www.disboards.com/showthread.php?t=1345319