Funny you should mention that. I grew up with disdain for American cheese. It was just processed flabby, no taste nonsense compared to a good swiss or cheddar, not to mention dozens other international and artisan cheeses. This coming from a poor working class American farm kid mind you. I'd never order a cheeseburger with American cheese--always a better option--at a diner let's say...we didn't have McDonnalds or the like in my town when I was a kid. So fast forward to adulthood, maybe ten years ago, I'm watching a Food Network show, can't remember the show name. There was Mario Batali ( yeah the me 2 guy), I think Michael Symon, and maybe Bobby Flay in it. They were filming at a NYC burger joint where the chefs like to eat--so a chefs chefs place. Not a fancy joint just good. And these three chefs were singing the praises of American cheese as the choice for a cheeseburger, even a gourmet burger. Something about the soft creamy melty gooeyness melds with the fat of the beef burger and food alchemy happens ( I'm beyond paraphrasing here .) So I tried it. I have to say, they were right. It works. So now I buy American cheese, just for cheeseburgers.
As for diner food - patty melts