I think Disney is always busy, no matter what the crowd predictors forecast. We will visit 3 times this year. In April it was supposed to be threes and fours the week we were there, but it felt packed to us. In early September it was shown as ones and twos, but in we still thought it was pretty busy. We are going back from Dec 3-10, and we just assume that it will be slammed and plan accordingly. If it isn't, we'll look at it as a bonus, but we go into each trip expecting the crowds will be there--it's part of the experience. If you let the assumption that heavy crowds will ruin your vacation, it becomes a self fulfilling prophecy. Bottom line--just assume that it is always busy. Decide what is important to your family and plan accordingly, but when that is done, just have fun.