I'm American, born and raised, and I've always found this aspect of our culture really weird. Maybe it's because I'm a first-generation American, but my mum wouldn't have been caught dead making a Dorito-mac and cheese bake or lasagna soup (a new one for me).
I have a friend who grew up with me in California but has spent her adult life in Texas. She'd be all over lasagna soup like a rash.
Texans love a soup can and 'hydrogenised tomato-flavour dust' bake (thank you, Coldland- does anyone remember that from Shooting Stars?)
Macaroni cheese made with American cheese ( cheese slices )
Obviously, you haven't been subjected to the abomination that is Kraft macaroni and cheese in a box... macaroni and powdered American cheese. Don't be fooled by the 'sauce mix'. It is just gross. Sauce mix makes it sound palatable. Powdered American cheese mixed with milk... I'd rather eat army rations from the Civil War. Hardtack, any day.
Mind you, today I found myself seriously baffled by my former love of tinned New England clam chowder with oyster crackers. I totally still would! 