I think my biggest fear about moving to the northeast is a dearth of good tortillas, salsas, beans and the like. Probably unfounded, but our diet is something like 50% Tex-Mex! I would have to relearn cooking if I didn't have these things around.
That said, I have a lot of love for the less common dishes from across the border, I just don't make them much, particularly because I'm a vegetarian. We still love squash in our tacos, soft cheeses, and mock chorizo and charros, but goat, seafood and lard in every baked good just don't cut it in our home.
My favorite thing at the Mexican seaside resort I visited was the breakfasts -- tucked away from the hot buffet and American cereals was a table of local fruit, fresh soft cheese and local pastry, along with fresh juices and horchata. I could do breakfast like that every day!