[0] A mile is essentially the farthest the average person will comfortable walk versus driving a car for travel that does not require carrying anything back. Once you add in carrying things (e.g. groceries) it drops to half a mile. Anything less dense than that and people won't want to walk, anything more dense than that and you're into standard city planning.
[1] Assuming you're American of course and obviously I'm not about to ask you to dox yourself, considering this type of thing can vary right down to the neighbourhood level.
If you can walk to these things, you don't live in the areas the parent comment is talking about. "Suburban sprawl" doesn't mean all suburbs, it's specifically the ones which don't have facilities and community.
https://en.wikipedia.org/wiki/Murder_of_Kitty_Genovese
If you pack people in too tight they just tune each other out.