You'll lose any ticket discounts, as well as any resort discounts. Rack price on the rooms with
free dining can sometimes be more than a room discount and paying out of pocket.
As for my family, we love to go to DW in the fall....but will not go during a free dining period ever again. Too crowded, both the parks and the restaurants. Getting reservations can be insane. If they're going to continue the free dining promo (which I wish they wouldn't), I wish they'd come up with some system where the FD folks couldn't make reservations at the 180 day mark...maybe more like the 90 day mark or something.