The Plaza is probably the "fastest" but some folks have expressed concern about "spending" a TS credit for someplace that is typically so low-priced. (It wouldn't bother me, though, if that is what I really wanted.) Of course, that assumes you're at MK. At Epcot, your best bet would be Biergarten, and at D-MGM Studios, your best bet would be Hollywood and Vine, as formernyer suggested.