Sure, I think if a doorbell exists, it's fine to press it. For me, I just don't want to get overwhelmed by their barking dogs or greeting 4 other people. Sometimes, I'm just not in the mood and just want to see my friend one-on-one. I'm not doing it for other people. I'm doing it for myself because I find the experience of calling someone when I arrive to be a lot more pleasant in some cases. Those cases happen to occur more often when my friends are young. i.e. living with lots of other people or with their parents and family dogs.
