The walking was NO PROBLEM at all. We were located in Ranchos, on the very back of the building next to the parking lots (great location actually, because we were so close to two different bus stops). I walked every morning to the main building to get coffee, and it took me about 10 minutes. An easy walk, and very enjoyable. We were just a few minutes away from the big pool, so I'd stroll through here, and head over the bridge, and soon arrive at the Pepper Market area.
You'll end up walking much farther when you leave Epcot and walk out to the bus stops - now that seems like a long walk to me, especially at the end of the night.