Ironically it probably would take up less space than the infrastructure build for cars.

But this is the point made by the OP, essentially for the convenience to jump into your car a couple of times a year and drive to the wilderness without having to walk or take a means of public transport, you require cities to be build around those cars. The issue is you don't directly see the cost associated with it, because you're used to it. The thing is, if you actually had to pay for that convenience (because if we would not have to build the car infrastructure cities could be much cheaper) directly there clearly would be a point where you would say it is not worth it.