This is all true. We went at the end of August, and the crowds were lower than earlier in the summer.
BUT…that also means the park hours are reduced. Early in August, both parks will have EPA, and go until late in the evening. When the crowds drop, it goes to one park EPA, and closing at 7 or 8pm. We enjoyed the lower crowds, but EPA didn’t start until 8am, and both parks closed before dark, so no cooler hours and no nighttime show, either.