I've had steel-cut oats but I didn't like the texture. I grew up with what in our extended family was called "mush," which was cooked oatmeal with milk and a little sugar. A big pot every single morning for years.* Sometimes leftovers were fried in a little butter. This was in the 1940s and '50s so it was probably just whatever regular oatmeal was available then.
*Edited to add that we did have other things every once in awhile -- bacon and eggs, our version of French toast, etc. But it wasn't usual.