Ick. In Vancouver we have some areas which are basically paved with 5-10 floor buildings -- there's no space between adjacent buildings, and only a narrow sidewalk separating buildings from vehicular traffic. We also have areas with 30-40 floor towers separated by parks and playgrounds, with plenty of trees and wide sidewalks.

The population density is basically identical between these areas, but I can't imagine why anyone would want to live in a low-rise area.

(Incidentally, the reason we have low-rise areas is because the city has an absurdly long list of "sight cones" to protect views of the local mountains.)