I did, as a matter of fact, walk around NY and DC, around 15 years ago. Coincidentally, I have also been to (central) Florida. All of these were work trips, with a bit of vacation here and there.
So yeah, I get your point, in DC and NY people do walk and use public transport, elsewhere, it seemed similar, except Texas was bigger (even for walking). But I have that in Prague too.
I don't think the point of these articles is to dis on anyone, but really, point out collective procrastination we have towards climate change.