Part of the problem in the US is too much planning, alongside too many subsidies for cars. Look at a zoning map of any city: there's an incredible level of detail about what's permitted where. The local zoning code here in Bend, until recently, had a section on how many parking spots per customer for barber shops. As if, in a competitive market, those businesses couldn't figure out for themselves the optimal amount of parking to pay for to keep their customers happy.
Most of Europe is pretty walkable and it doesn't have that 'planned' look either.
Most of Europe is pretty walkable and it doesn't have that 'planned' look either.