Well, we were there last August 13th but it was the day Hurricane Charley hit so I am not sure how the crowds usually are that time of year--but the days following the storm were not terribly crowded; the crowds seemed to drop off quite a bit by the 15th and were certainly lower than when we had been there earlier in the month (around Aug. 6-7).
Have a good time and I will cross my fingers for no hurricanes for you!