Actually, I believe there are places at WDW that accept Disney Store gift cards – in particular World of Disney! I would bet at Emporium and so forth as well. This is from the Disney Store gift card page itself:
[I]Accepted at many Disney locations!
Bring smiles to your family and friends with the Disney Gift Card. For every occasion from birthday and holidays we’ve got a Gift Card they’ll love.
* Free Shipping
* Shipped to any U.S. address
* Available in $25 increments up to $150 plus denominations of $200, $250, $300 and $500
* Redeemable at DisneyStore.com, Disney Store locations in the U.S, participating locations at Walt Disney World® Resort, Disneyland® Resort and Disney Cruise Line®[/I]