You opinion on density is just that, your opinion, not everyone agrees.

Density means a larger selection of jobs, increased variety in entertainment (ie: more likely to find something you personally love), increased selection of medical professionals, increased variety in food, ability to avoid driving commutes, kids who can self-manage without being driven everywhere, etc. To some people that's worth more cramped living, to others it's not. Quality of life is taken as a whole and not based on part of the whole.