I find that circumstances, not the restaurants per se, make for the most memorable experiences.
I still remember our first time in DisneyWorld: me back after twenty years away, the wife not being quite ready to go yet in the morning, wandering over to Kona and sitting down for a super early breakfast. Very little going on, just the noise and scent of the misting whatchamacallit in the lobby, a friendly waitress, real coffee and a heaping plate of tasty brekkers.
And I still remember our first visi to the California Grill, alone after an exhausting day with the rest of our group, catching the Grill less hectic than we'd experience again the following year, getting some of the tastiest vittles we ever had.