How do they get there? What might not be obvious is that the parks are often far away, because you can't afford to maintain many parks because the tax base is too small.
I completely agree if we are talking about a typical suburb. A mixed-use area built for living doesn't have that issue. What I find really strange is that some people in these comments seem opposed to mixed-use areas BECAUSE their children will no longer be able to play in the streets. It's like some sort of weird, cyclical way of justifying the lack of proper pedestrian areas.
If the tax base is too small for parks, it's also too small to pay for the street/road infrastructure, and that's being subsidized by people outside of the community. If a community can't afford basic infrastructure (which should include parks), it isn't zoned to be dense enough.