I walked from about 8, was a good 3/4 mile but only minor roads to cross.
The biggest change now I think is that other people won't help, and there are not the same number of people about who could keep an eye on children alone.
There are 3 concerns for me; traffic is by far the main one, then the remote possibility of abduction, and the risk of older kids being unkind.
However I am sure that 90% of people would not stop to help out a child who seemed to be in trouble, for fear of what might be said against them. Also, the more parents who do drive to school, the fewer there are who are walking home with kids, so the problem grows.
I suppose I am thinking more about going to the park alone, rather than walking home, but when I was a child there used to be park-keepers, adults in their gardens, general passers by, all of whom would take a friendly interest in anything going on. Now the streets and the parks seem empty, and what you get instead are dangerous and selfish drivers around the school gates.