Even though I have the layout of each Disney park memorized to a tee, every year I am compelled to order the customized maps as a keepsake. We never actually use them while we are there, am I crazy or does anyone else do this also?
You are not alone! I usually order new ones just about every year! 
I haven't ordered any. I always pick up a map when I enter a park and rarely look at it. I want one for a suvenier.
I order them to scrapbook!
I always order one once we set our adrs. Then the kids and I sat down and put the stickers on our resort and the restaurants that we are visiting. It helps them feel involved in the planning of our vacation and helps them understand just how big Disney World really is.
You're not alone at all, I do that all the time! Mine sit on a shelf and collect dust 