I still use Kraft singles for burgers and grilled cheese sandwiches but for everything else I switched to higher quality cheese.
American cheese on burgers is fantastic, but there's definitely a gradient in the quality of the different American cheese products.
A close second would be a blue cheese such as St. Agur.
Both with a lot of umami goodness on the burger.
I will happily eat a burger with American cheese. It is good - but not cheese to me. It is more an oily softness than the smooth fatty softness from (dare I say real) cheese.
Maybe this comes from growing up where a "cheese shop" actually is a thing :-)
But cheese fries with american cheese are truly sinful and a very guilty pleasure. They're not common around here for which my heart is eternally thankful!