I believe Bitcoin obsession is a good thing because it will make you strive to get more and more over time and that is a financially positive thing for you if you actually succeed in gaining more Bitcoins over time because of your obsession with Bitcoin, and it obviously won't disturb other things in your life.
Still, obsession in medical terms is negative because they took obsession as addiction. There is a positve way to state interest and liking to Bitcoin in a higher degree and that is passion. just as you stated in the latter part of your reply.
Not because they are participating heavily on the discussion, they are obsessed with it. It is highly possible that technical discussion is very limited to its technical state, one question can be fully answered by 1 reply. Unlike the other board you stated where answer can be in different form of spectrum since it is more on the person's insight and not on technical terms.