I guess that we are in the few minority that DO nap. We always seperate times and days for rest. Example: do EMH night, then take it easy the next and only head to the parks after lunch, and we ALWAYS have one off day. WDW for us is a vacation, and there have been plenty of times that we've gotten back home full of fun, but extremely exhausted. We want to have fun, but relax as well. I also found that an off day is great b/c you really get to know and enjoy your resort, the kids loved the pool and playgrounds, and after all we all know that when you stay on property you are paying a little extra, so why not enjoy your resort as well??
I think that each family has their own way of vacationing, so to each his own. There may be a time when my boys are a little older that we may have to change this, but for now it works for us.
Have a great vacation!