We visited from August 5-13 last summer and it was busy most days and nights. Like many people, we tried to be at parks for opening...rest mid-day, when it usually rained for a while...then returned to the parks until closing at night. We had park hoppers and sometimes when one park would get crowded we'd head to another. We made good use of Fast Passes and got to ride all or our favorites several times.
We're already planning to be back next August!