I guess it's great advice if you live in New York or Disney World. I have a forty minute walk to the nearest bus stop and depending on where I want to go in town and how many transfers it takes, it might take me 2 hours to get somewhere in my mid-side town.
Meanwhile, I can reach anywhere in town in twenty minutes by car, and I can carry $800 of groceries in my trunk. And I don't freeze my ass off in the snow.