Meet and greets are free, bring your card for verification. You also get discounts on several different tours and in some restaurants (I think). They have speacial financing when you book your trip with your Disney visa (I think it's 0% for 6 months). There's also some incentive to use your Disney visa for purchasing DVC I believe. And of course, getting Disney Dream Reward Dollars - which you can cash out as a Visa GC or for use in the parks or shop from a rewards catalog.
D4D