No I would not go to any Florida Amusement park in July. I try not to go to ANY amusement park in July, because that is when they are typically at their most busy time of the year. And, I do not like the heat.
I have gone to Disney World in February, and also in April, and both times the park seemed just as crowded as it would be at any other time. I also hit Busch Gardens in Tampa each time, which was much more pleasant because it wasn't nearly as crowded as the Disney parks.
I couldn't imagine what Disney would be like in July. I'm guessing hell on earth with scorching heat, and massive crowds. I had a friend who went to Universal in the summer and he said it wasn't worth it because you had to wait too long to go on just one ride.
But, when I went, Islands of Adventure didn't exist, so, maybe the crowds aren't as bad, with so many of the surrounding parks like Sea World trying to cash in on crowds as well.
My typical amusement park trips are in June or in late August.
And, might do the Florida parks in March. Before or after Spring break. I don't want to be there when all the rotten kids are there. No thanks.