How odd, as a Scandinavian (more precisely: Dane), I can relate to almost all of those. Maybe it's a Nordic thing and not just a Finnish thing? Bus stops need a lot of place here, because people don't want to stand close together, for instance.
I am a Swede with Danish and Norwegian heritage and I think this is pathological. If you try to resist and be social anyway, you will seem a bit strange or even feminine if you do it in a seemingly smooth way...
If that someone were intellectually, sexually or some-other-way attractive, would you have done the opposite and tried to meet up with them? There are a lot of people in the world, some more interesting than others.
The correct answer is: It depends. Because there have also been times when I went into the hall, fully aware that my neighbours were there. The mood required is one where one has enough energy to interact with people, and that includes ignoring them. But I'll confess - because I am unfortunately human - that attraction is likely to be a factor as well.
I tried for a few months when I first arrived in Estonia. I got mixed reactions and was about to give up, but then my neighbours were the ones greeting me. I have since made a point of greeting any neighbour I meet in my building.