If you aren't going the week before or after Easter, mid-April would be much more desirable. Not just for the crowds, but it won't be so hot and humid. I've been twice in late June, and the humidity was unbearable. I'm used to hot weather and some humidity, but it's no fun at Disney World. We just returned from our spring break trip and couldn't believe how nice the weather was. I think in mid-April it would be perfect.