It's pretty far down the list. I really do not enjoy driving, sitting in traffic, or parking. I also do not enjoy spending money on cars, car maintenance, gas, and parking. I do enjoy riding my bike, spending money on bike stuff, and wrenching. I'll also admit that the smugness factor of showing up by bike when it's raining/snowing/generally foul outside is a bonus.
It's not to say that I hate the environment - I try to do my bit. If I'm honest, though, the work trips I've taken in the past decade have completely tanked any carbon emissions I saved from bike commuting and doing most of my errands by bike.