We stayed there in March in Building 8. It was awful, really. I'm fit, no health problems, exercise regularly. But after a day of walking at the parks, getting back to the room was annoying. I guess the worst part was that once we were at the room, it felt like too much trouble to go to the food court or gift shop, so we kind of felt isolated and stranded out in the "middle of nowhere."
Also, there are some ugly sections between the food court and the Lion King buildings (which you must walk through on the way to LM) that are like a desert: no trees, no buildings, no shade. Boring and hot.
We even drove our car to the main building once... That's how bad it was!
I've had some far away rooms at AKL and Pop, but at least the walks there are more pleasant!