Cul-de-sacs are designed to
frustrate cars! It is NOT at all hard to make something like that
very walker friendly - just add paths for pedestrians and bikes that slip between the homes in strategic points, and now to drive somewhere you have to go around a whole square mile, but to walk it's direct.
And many suburbs in the USA are actually technically their own towns, some older, some younger, and you can walk around just fine if you plan a bit and want to.
After all, if you live in a town of 10k people almost by definition you can walk everywhere that is available.