Then it was yugoslavia, and then slovenia (i didn't move, the country fell apart)... late 80s, and the whole 90s.
So large apartment buildings in large neighbourhoods with a lot of kids of same age there (due to the way apartments were distributed), and after school, if you were bored at home, you just went out, because someone was always outside.
Parents usually worked from 6am-2pm (factory workers) or 8am-4pm (administration), so they would come home after the kids, but this was seen as normal here. The elementary schools (6/7yo - 14/15yo here) were usually a walking distance from home in the cities, so we'd be by ourselves... High school usually ended somewhere between 1pm-3pm, and you'd take a bus ride home, and depending on where your parents worked, you might still be home before them.
We did have extra-curricular activities, but usually you did one thing (eg. had football practice twice per week for 2 hours if you werent a "pro" in your age group), but it was unusal to have your day totally filled up.
I don't have kids, but a lot of my friends do, and a half of them do it in a way as we did, but about half of them sign their kids up for every activity possible, so after school it's horseriding lessons, and then tennis practice, and then music school, so they drive them around for that.... I'm not sure how a busy schedule like that would work on me in that age, but i'm pretty sure i prefered the laid-back method, and I still had no issues, from elementary school to my engineering degree.