I have stayed in the farthest out room in the wing, and walking at a normal pace I was still to the 4th floor of the tower in under five minutes. As far as walking to MK, it took maybe 2-3 minutes longer depending on whether I cut through the tower on the ground floor or walked around the tower outside. Cutting through didn't take quite as long.
My main beef with the tower are the elevators. They are too small and too slow. I was on the 9th floor last summer, and we actually took the stairs down each time because the elevator situation was so bad. The wing does have two elevators (in separate parts of the wing) but with three floors I seldom use them because the stairs are so quick.
The biggest difference is that the wing rooms do not have balconies and the tower rooms do. Otherwise the size, layout and decor are the same for the tower rooms and the wing rooms.