I can't really speak too much considering except for Earl of Sandwich, there's nothing really else I eat on a repeat basis though Tangerine Cafe, Sunshine Seasons, Flame Tree BBQ and Be Our Guest will certainly be must eat repeats for future trips, as well as Earl of Sandwich.
But anyway, there are a lot of foods I wished I could have discovered earlier. I guess that's one the pros of not going every year. You have more time to research food!
I think the biggest one was that Dole Whip shockingly. Never knew it existed on my past trips. I mean, I did watch Unwrapped on Food Network and a bunch of Disney World related videos that originally aired on TV via YouTube but the Dole Whip was never really mentioned. I discovered the glorious treat online about 2-3 years before my last trip in 2013 on general Disney discussion forum.
Considering I always get the Full Montagu at Earl of Sandwich, I'm almost very certain once I've tried the Holiday sandwich, that will be another food I wished I never passed on. Then again, before the Holiday sandwich was a permament item on the menu, I was unable to get the sandwich because I never went during the holidays. But anyway, next trip, holiday and Full Montagu sandwiches for me. No excuses. 
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"All my life I wonder how it feels to pass a day, not above them but part of them.
And out there living in the sun, give me one day out there, all I ask is one to hold forever. Out there where they all live unaware, what I'd give, what I'd dare, just to live one day out there."