But if you are honeymooning at all at Disney you can use gift cards for everything else, including your room! To save up for our trip, DH and I each buy a gift card just about every pay period. We use our Target Red Card to save 5%. We use them for meals, souvenirs, snacks and to pay on the room. You can even use them to add tip at TS meals.
So, if you are staying at Disney for your honeymoon or at least for a few days with the wedding, you might want to purchase some. It won't be as much free gas as paying for the wedding, but I bet you could get some significant fuel savings!