I'm a fairly introverted, reclusive person. Much like your one neighbour. I keep to myself.
I do know my neighbours. The couple on one side is delightful and the woman on the other side is a "Karen" who I prefer not associate with. She is an outdoor person and only "talks" to me when she has a problem with how I keep my yard. Ironically I would probably use my yard more (and thus tend to it more) if she were not always outside in her yard being loud.
We have alley parking and garages in the rear, and I have workshop in my garage so I met a lot of my neighbours on the other side of the alley when working on projects... they came and introduced themselves and asked me what I was working on. They are delightful, but they also interrupted me which is annoying.
My wife and I are easy to get along with and go out of our way to be friendly, but would honestly rather not know that our neighbours exist. Car doors, the sound of people talking, dogs barking, kids being loud, lack of privacy in our back yard are all things that really bother us. On the flip-side, when the tree in our front yard shed a branch so large that it was practically a small tree, the delightful couple next door helped us clean it up. I felt a sense of community that day and I started to get what others find enjoyable about it. Still, we often talk of going "going rural" and not having neighbours at all.