I had a friend who had an apartment in Hamburg, roughly 600m from an S-Bahn station. within 50m of that station was the neighborhood grocery. You walk up to take the train to wherever, and on your way home you stop off in the Biergarten first, have a few, then stop in the grocery before walking home - downhill no less for the arms full of packages side of the trip. Not a bad layout, but about half the residents still had cars parked all over the streets which they used more or less daily. So, in some ways, the US arrangement just doesn't bother with the under-utilized trains, but it also eliminates them as an option which really sucks when you want to go to the airport, or take an inter-city train somewhere...