We did a trip much like the one mentioned by the OP in 2009, except ours was 2 days at SW, no US and we stayed at SSR. While we didn't actually do any Disney parks, we did venture over on our "down day" in between the SW days and enjoyed hanging out at AKV for a little bit, and played some minature golf at Fantasia Gardens. Having the car was great. We were in Congress Park too, so the exit was right there close to Hotel Plaza Blvd, and the quick access to/from the 4. Now the kids are asking to do the same kind of thing with 2 or 3 days at US, and we'll probably stay at SSR again for the easy access.