Just got back from the GC on points.
It's a boondoggle. I will be sad to see this option go away once VGC opens up and points reservations are no longer allowed at GC for the hotel room.s
As others have mentioned, you are treated like every other hotel guest including mousekeeping and turndown, with the exception that you don't have to pay the daily resort fee. We also got a few goodies (some baloons and a nice "welcome" packet) at check in. Like others have said, self parking is free, but valet is $17 per day, just as it is for cash hotel guests.
Also, when you're staying in the hotel on points, you get the hotel check in time -- 3:00 p.m., instead of the typical 4:00 p.m.
DVC check in time.