October used to be our best kept secret but I think everyone bragged about it so much that los of folks caught on. While it is busier than it used to be, it is still much less crowded than the summer or major holiday periods. So you might have to wait an average of 15 minutes for an attraction. With fastpass, the waiting is a cinch. Also if you are an early riser you will be able to walk right on attractions in the morning. Avoid going to parks that have early entry unless you plan to be there when it opens and if you do, head over to a different park as for some reason people are drawn to the early entry park even if they get out of bed at noon. If you've ever been to WDW high season, you will be delighted with the October crowds and weather. I have gone when it was really hot and humid and couldn't get certain family members to leave the room until night rolled around.