My family has travel to WDW every early August (at least we have for the last 7 years). Crowds are really manageable. I prefer to go early August because you can still enjoy the late night park hours and take advantage of value season rates. If you wait to mid/late August the parks close pretty early. Most times even before dark. Last year our last day fell on the park hour changes. I really hated that. Every park was closed by 7 pm. The only park that was open was a water park.
And like a previous poster mentioned, I went to the early entry park every morning, returned to my room early afternoon. Most times we either napped or took a swim. We would return to the late exit park that evening have dinner and watch the crowds fade away. I love that late exit. If you can stomach it, there is not a ride you cant ride if you stay late. Lines are nearly zero after 10:30 11:00 pm.