We just got back last Friday, having been there May 8 - 13. While the crowds weren't terrible, it was busier than I had anticipated it being. With the end of the school year being so close, I figured families wouldn't be taking their kids out of school....but my thinking was wrong! But we never had to stand in any really long lines. Fastpass helped with that also. We've always previously gone during the summer, fully expecting and experiencing crowded parks. Compared to summer, crowds weren't bad.