I don't think obsessive is the right word. We don't think of automobile commuters as obsessive simply becasue they always drive their cars.
In fact, I'm no more committed to my preferred mode of transportation than the typical car owner.
Agreed.
My bike is just how I get around and while I have alternatives where I live- excellent public transportation in several forms: express bus, local bus, commuter rail as well as 3 or 4 Zipcar locations in walking distance and an Enterprise car rental. I make use of all of these options when I feel like it but my preference is overwhelmingly the bike whenever possible and often for short local transport that means I bike, even in inclement weather.
With all that said, today, the college I teach at cancelled classes so I may cross country ski to the market later instead of take my bike.