I think its more of a "hotel" vs. "motel" issue. The Deluxe resorts have interior corridors, central air versus a through-the-wall or window a/c unit, nicer furnishings, and generaly nicer grounds. The Deluxe resorts also have more activities for guests. Many are also closer to one of the parks.
The Polynesian is multiples of what it costs to stay at the All Stars. But my wife would rather not go to Disney than to stay at the All Stars ever again. (Too loud, room too small, very crowded pool that was not great with little kids, no table service restaurant, not to mention someone got into our room while we were at WL for dinner and used the bathroom facilities and did not flush!)
To each his own! (I like the new E-Class, but I drive a Honda). Have a great time wherever you stay!