In the "suburban" lifestyle, kids can do very little without being taken someplace by their parents in a car. They can't walk to a playground, a library, a store, or even most of their school-friends' houses. Growing up in the City, you can walk to all of those things, and more. So suburban parents have the ability (and the burden) of managing all of their childrens' activities, except for those that happen in the immediate neighborhood. And in my experience that is not much.
The main difference is not the attitudes of the parents it is the difference between being raised in a place where everything you need to entertain yourself is within walking distance, and living somewhere that requires a car trip to do anything interesting.
When I was growing up, I walked to school, to church, and to my part-time jobs. I lived within walking distance of virtually all of my school friends, plus other neighborhood kids who went to public schools (I went to parochial school). I could walk to the library, several parks, the museum, four college campuses, several movie theaters - hell, I could even walk to the railroad tracks and have an "adventure" or two down there. I could participate in Little League, school sports, cub scouts and boy scouts, and go to the Boys Club with essentially NO SUPPORT from my parents (and I got none). Can you imagine that happening today in the suburbs? Never happen.
My son, on the other hand, lived within walking distance of only three or four of his school friends, and could not walk to school, church, any stores, any library or parks, etc., etc., Virtually everything interesting in his life was facilitated by a trip by car or bus.
Essentially ALL of his sports-play was supervised: either a formal practice or a game. 10% of my sports-play was supervised. It was mainly pickup games of baseball, basketball, and touch football. A never-ending "sports" season.
Huge difference. Much less room for self-determination and development.
When I had a "problem" with a neighborhood kid, it had to be resolved in one way or another. Our parents knew each other (probably went to school together), and we were all going to be living in the same place, playing with the same kids, for the entire foreseeable future. When my son had a problem with someone, they were just cut off. WGAS? The parents didn't know each other and who cares if there is one less neighborhood kid to play with?
Whole different world.