It can be used to pay for meals at Disney, but you cannot use it to add the dining plan. The DDP has to be added before arrival, and you don't actually get the GC until check in.
Use WDW.com to price it out - DDP for us this year in July is around $900, so even the deluxe $750 card would not quite cover that cost if you are looking to justify it that way.
i think it depends on how long you go for and how many people are going,
for us we are going 15 nights so the room discount and paying for dining plan was a better deal
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