Paris is very densely populated - I'm surprised anyone attempts to drive there, because at these densities and distance between buildings it must be horrible.

My point is: it's not that clear cut. Removing cars is what makes places like Paris bearable, but the problem lies in the sheer population density that a truly walkable city over a certain scale requires.

I moved to a city that has 2/3 the population density of my previous location and even though it's just swamped with traffic, it's actually quieter on average.

I feel like population density is completely left out of the conversation. From my experience there's a middle ground between car-oriented suburbs and human pile-ups like Paris(or other cities approaching this density) which is rarely explored.