Disney doesn't offer many public discounts on rooms because they don't have to. Those resorts are almost fully booked every day of the year.
They do offer AP rates that can be substantial (in October, we paid $279/night for a CONCIERGE deluxe room at the Grand Californian) with the AP discount rate.
Otherwise, all you see offered is deals like "stay 5 nights for the price of 3" when you purchase a package through WD Travel Co.