However, we live in an area (Berkeley) where yes, kids have homework, but every single day of the week, after school, all the kids on the street are running up and down, riding bikes, playing wall-all, shooting hoops, and running in and out of eachothers' homes.
In the evening, right when it gets dark, you see parents walking around or calling out their front door to ask the kids to come home. My son now carries a walkie-talkie with him and we signal to him to come home.
Your experience is likely a function of your environment. Our neighborhood school is definitely not a top 20 CA school--or even a top 100 or 250 school. But, our kids are happy (except when they have to come in for the night!) and in turn, so are we.