We did laundry at the Dolphin (stayed at Swan). Ranged from virtually empty to packed with people. I took a book along the one night to read and the other time I wandered up to the gift shop - no one messed with our laundry.
We were gone for 18 days and 17 nites (1 nite University Visit, 2 nites on the road, 1 nite at Universal, 10 @ Swan, 2 at Marriott WGV in St Augustine and 1 on the road again). So with myself, dd and 18 year old son we racked up the laundry!!! It was really warm so I was changing 2x per day and when he was golfing he changed a minimum of 2x - once even 3x in a day.
I took along dryer sheets and the soap tablets (do they still make them? My local WM no longer has them) as they travelled really well.