my husband and i went last week (june 28 - july 5). i have to say i was extremely surprised at the crowd level... it was not nearly as high as i was expecting from all of the reports. we both hate crowds, so i know it was not bad. however, on july 4, we made sure to get out of the parks before the fireworks, the crowds were obviously picking up. made one major error.. got on a bus to downtown disney to connect to our resort... ouch. took 1 hr to go from the marketplace to PI. I would suggest avoiding that area on holidays.

other than that, the crowds were definitely lower than i thought. we got up late on most days and managed to see everything we wanted to.
hope this helps.