Breakfast buffets are real values if you are comfortable eating that heavily at the beginning of the day. You can skip lunch easily, and then have a lighter dinner.
Sushine Food Fair, or nearly any counter service in the WS is a good value for Disney anyway.
Another option is to go offsite for lunches (Publix does a nice submarine sandwich) that you carry into the parks (Disney parks). You'll see any number of people bringing in their own lunches/snacks/drinks. Just avoid glass, and sharp knives and you'll be ok.
We aren't fans of Earl of Sandwich or Puck's Express since they've changed things and raised the prices. What was once a tasty meal and true value is no longer the case.