The US isn’t that much larger, I don’t think this argument holds. The geography and locations of population centres seem more of an issue.
Just search for one of the many pictures of the state (state!) of Texas superimposed over Europe.
The US is freaking huge compared to Europe.
I have compared them, and I don’t see what you’re seeing. Depending on how you measure (do you include European Russia, ie the bit west of the Urals?) Europe is larger.
https://www.worldatlas.com/geography/are-the-usa-and-europe-...
https://www.mylifeelsewhere.com/country-size-comparison/unit...
I've been tempted to do at least part of one of the long distance US train routes but I think I'd get pretty bored, I'm guessing the food isn't very good, and I've spent a lot of time out West.
Driving is relaxing or interesting for me, almost no matter what. Even when it gets stressful I don't mind it. But I feel for those who don't have that same predilection, because everything would be blocked behind a chore.