I was at La Cantina in Mexico and it had a huge combination platter that feed the two of us. Even the churro was huge for us to split. This made our DDP go even further since we were only using one meal at a time. You should look it up on the menu at allearsnet.com
I second that Cosmic Rays comment. The chicken and rib combo is way too much for just one person. We also do the orange chicken at Lotus Blossom in Epcot. If you add 1 order of eggrolls (2), it's more than enough for 2 people.
I haven't been there but I have heard that Pizza Planet at MGM has large meals that include a pizza and salad. Lots of folks report it was plenty to share.