I've made it a point to get to know the neighbors. It sometimes takes a while. I didn't find out until recently that I already knew two people on my block from previous business transactions. I just don't see them that often. I still haven't talked to one of them even though I've lived in the neighborhood for over a year and I'm out and about quite a bit.
I do think cars keep us from connecting with people immediately around us. Right now our family doesn't have a car. One of the things that I like about it is that I see lots of people in my area while I'm out walking. And also, because I'm out walking, people see me even if they are in their cars. I think our neighborhoods would be better if people intentionally got out and walked around or did short errands on foot, even if they own a car. That's just my perspective on it.
I was blaming garage doors but not giving enough credit to cars regarding the disconnect I keep seeing. Where I live the public transportation system is practically non-existent. I am curious what you consider to be a short errand.
What size of a city do you live in? Do you feel that your city is set up well for walking/biking/public transportation?
I live in a city of about 50 thousand people. There is public transportation... but I never take it. I walk everywhere and ride my bike sometimes. City sidewalks are fairly good for walking. They are trying to make streets more bicycle friendly.