Interesting. This is the first post about free laundry, except VGC studio guests receive free tokens. I hope this is a permanent policy change, but OP should bring some cash.
A map of the laundry room locations:
The larger laundry room is on the 2nd floor, with 6 washers and 12 dryers. There is no 2nd floor hallway connecting this area with other wings of the hotel, so the elevator near Napa Rose should be used. The door requires a room key.
A second laundry room was added on the 1st floor along with the VGC wing, with 2 washers and 4 dryers. This room was added to support the VGC studios (villas without washer/dryers), but is available for all GCH guests. The door is unlocked. There is also a little used outside area across the hall, with tables and chairs (quite noisy, since Goofy's Sky School literally overlooks this area).