I have the Disney VISA but as far as rewards cards go, it's not that great. I have never taken them up on any of their offers for rooms or packages at WDW because there are almost always better deals available to the public or AP holders.
The $50 DDRD is a nice incentive to get you to apply for the card (it's the equivalent of charging $5,000). But they really need to offer something more to keep you charging on their card beside's the 0% interest for 6 months on packages booked at WDTC. Every once in a while, they'll offer double rewards for purchases like gasoline and groceries, or for spending over a given dollar amount per billing cycle.
But, I think that there are better rewards cards out there. Capital One is good for those airline tickets. DH's Diner's Club offers a lot of flexibility in their rewards program. AMEX has some pretty good offers as well. The advantages of the Disney VISA are that there is no annual fee and their website is pretty easy to navigate. I find it very easy to make payments to my account and can post several payments per month rather than waiting until the end of the billing cycle. The disadvantages are the high interest rate and the two-cycle billing method that leaves you paying interest on your balances for 2-months instead of one.
If you're set on getting the Disney VISA, you should know that the DDRD are good for 60 billing cycles from the date that they are posted to your account. That's about 5 years. You need to transfer the DDRD to a rewards card before they can be used. The first transfer must be at least $20 and all subsequent transfers must be a minimum of $10. Once DDRD are transferred to a rewards card, they expire on Dec. 31 of the year following the year in which the rewards card was issued. Confused yet? In other words, if you were to transfer $20 DDRD to a new card today (8/17/04), those DDRD would expire on 12/31/2005. If you keep them in your account, they will not expire until 5 years from when they were earned.
I'm sorry that I can offer more of an incentive for you & your DH to get a Disney VISA but if you research the many rewards cards out there, I think that you'll find that there are better deals.