We visited over Mothers day weekend this year for my DD 2nd birthday. The crowds were non existant. I don't think we used fast pass but 1 time and that was on Mothers Day. Even then the crowds were nothing like in the summer. We were told by a CM that the end of May is when the crowds start because of school getting out.
HTH
Two years ago we went from May 17 - 25 and there were no crowds until Friday the 24th because it was the beginning of Memorial Day weekend. So I'd say from Memorial Day on is when attendance picks up. BTW, we've also been to WDW the first week of May and it is a beautiful month to go. The Flower and Garden Festival is going on in Epcot and we've lucked out with great weather on both of our May trips.
We were there after Memorial Day through June 9, and the parks were getting hectic. It was worst at MK, where getting Fastpasses became essential mid-morning. AK was pretty quiet (just one fastpass) both times we went.
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