We get discounts at several restaurants -- 10% at Cape May Cafe, lunch at Fulton's, maybe Yacht Club Galley, a few other restaurants at Downtown Disney, and 20% at the Dolphin and Swan restaurants. We get a few dollars off at the Waterparks, DisneyQuest and mini-golf. When the Spa at Saratoga Springs reopens we'll get a 20% discount, as well as 30% on a select treatment each month. We also get discounts or "free gifts", like a chocolate bar if you spend $10 at Ghirardellis, at some of the shops in the marketplace.
The discounts change from time to time -- Cape May Cafe is a new addition -- and are always printed in your welcome material when you check-in.