I was one of those that didn't think I had a real pattern of travel and UY didn't matter. If I can get a a good deal on airfare/hotel, then sign me up! Then I thought about the inverse- are there periods I know I will not be travelling to WDW? Only when I thought about this did I realize that I've been avoiding summer (hot and humid), and that really elevated the importance of UY. I eventually settled on October (May 31 banking deadline). So it's not only thinking about travel patterns, but also patterns of non travel (if that makes sense).