Summer works this way: crowds increase every week from June 10 - July 4, then decrease every week from July 10-end of summer.
So the first week of August has lower crowds than the last week of July, which is lower than the 3rd week of July, etc.
The crowds should be OK. High, but not impossible. Lots of people, but 60 minute lines instead of 90 minute lines.
The other thing of note that as summer progresses the rainy afternoons begin. So in August you'll see more rain than in June/July. The heat and humidity are just brutal. It's really a beating. So don't expect to be at the park from RD to close. If you're onsite go back for a swim, if you're offsite book some ADRs for sit down meals at like 2pm to get out of the sun and into the A/C for an hour and a half.