Yes I'm aware there's a slight separation between the 2 counties but last time I visited, there was no real break from one valley to the next. And I can only assume it's gotten worse.
Used to be when you entered Utah County, it was like entering the wild west. Open spaces for miles and po-dunk gas station towns until you reached the metropolis that is Provo/Orem.
Now it's indistinguishable from the valley to its north.