Even when cars are prioritized, traffic makes even the smallest errands a problem eventually; roads simply don't scale.
And cars are by far the loudest thing about cities at almost all times. They make the very air hostile with pollution and heat. And, worst of all:
> I simply hop in my vehicle and can be anywhere I want in 3-15 minutes
You do this at the direct expense of everyone else in your city. You make the streets unwalkable and the city unlivable. You are insulated from the sounds and dangers that you are creating around you. (I'm just using you as an example, I don't actually blame you for taking the only option you've been given.)