Busy.
July and the first two weeks of August are the busy time for all amusement parks in the USA. The last two weeks of August it lightens up as kids go back to school.
The only positive about going in July, is that the park stays open until 10pm, and there will be fireworks at USF. Your attack plan is to arrive early, visit for a few hours, then go back to your hotel from 1pm - 5pm (very hot), then come back at night.