Just wanted to say that I completely disagree with Jane on the world being just as safe/dangerous now as when we were kids, the only difference being our perception based on information-overload these days.
I'm pretty sure that was just a guess on her part, because as technology has advanced, so have crimes against children. But even if she IS right...let's say we are simply better-informed nowadays, is that such a bad thing?
It's the reason we use car seats now. It's the reason we don't put lead in paint. It's the reason we do a thousand other things that our parents didn't know to do for us. So even if kidnapping rates, etc. haven't statistically gone up (which I still contend, but am too lazy to look up), the fact that our awareness HAS is not a bad thing. It means we have an obligation to protect our children from known dangers.
Our parents did the best they could with the technology and information they had at the time. It's our job to do the same.
So follow your gut in regards to your kids "supervision milestones"....but do NOT feel like you're overprotective, or paranoid, or a bad parent in any way if those milestones come a LOT later than yours did as a child.
Join the club, lol.