It really just depends. I've been in July when it hasn't been terribly overcrowded and not uncomfortably hot either. Other years, it's 100* and the whole area from POTC to HM is packed elbow to elbow. One year, a father nearly ran over our 3yo with his stroller and he and Dh nearly got into a fistfight when Dh told him! I don't really like going during July or August, but of course if that's your trip, you just make the best of it!