We have one but rarely use it any more. We don't really care about the interest rate because we tend to be "deadbeats" that pay our bill off every month. The benefit is you get points for every dollar you spend and they do periodically give you bonus points, say, for every dollar over $500 you spend on groceries and gas, you get double points... but more you tend to spend on a monthly basis, the higher the threshold gets. So we started getting offers in the mail that we had to spend thousands of dollars to get the extra bonus points. We stopped using the DV card as it wasn't as advantageous and now basically use another car that we earn airline miles on instead. Also Disney Visa card members used to be invited to free pre-screenings of movies but I don't think they have been doing that in quite a while. They also used to give cardholders a free character greet photo at DCA in California, and a free daily stroller rental at DL/DCA (california only). I haven't looked at their site in a while to see what deals they are offering right now. You might also post on the budget board and get more responses on this topic.
hth!