So many of my Disney memories take place at Fort Wilderness. My family stayed there five times between 1995 and 2000 (when we sold the pop-up camper).
If you do finally decide to stay there, get a copy of the campground's map, do a little research, and request a loop close to a trading post. Also, when you make the reservation, request the spot closest to the comfort station.
Really the only complaint I can make about this otherwise perfect campground is that the fill around the sites (I think its ground-up sea shells) gets wet from rain, it tracks worse than anything I've ever seen! Be sure to bring a good broom and maybe a small vacuum to keep your camper clean.
Oh, and don't forget to check out the Lawn Mower Tree after enjoying breakfast at Trail's End.