[NASAMan]

Typically between 1:00 AM and 8:00 AM everyday.

JK! (But true!)

Please don't even attempt to prognosticate when crowds are low, as normally slow times are seeing an increase of guests from Europe (where the dollar is low, meaning vacations at WDW are cheaper for them). The best thing to do is plan for your trip. Make sure your dinner reservations are in place. Allow time for personal discoveries and to watch and listen to the parades and musicians. Always be prepared for a crowded day: if it is not, it will be a pleasant surprise. Also, look up and know the rules about FastPass. It will help. And above all, enjoy the time with your family! Make a steadfast family rule: no whining! Everybody choose one thing they want to do no matter what, do that one thing for everybody (at the reasonable time - if the one thing is to watch Wishes you will have to wait) and if you have to stand in line for 90 minutes, spend the time chatting with other guests, play guessing games, look for hidden Mickeys or other treats in the queue line (the new Toy Story Midway Mania is great for this) and just enjoy being with your family. AND make sure to thank Mom and Dad a LOT!