Well, I really think the advantages of going digital for shooting colour are just overwhelming, so I believe it is natural that most hardline film users do it for the sake of B&W, because the B&W film still delivers a tonality that digital can't match, and on top of that it has it's very distinctive look. Moreover, I find that shooting in B&W and adjusting the output so that it matches your desired vision is just much more natural - maybe because I grew up in a darkroom, dodging, burning, solarizing, etc... so even if I do this today in PS, it is very much the same thing. The end result, are often images that convey how I see things, rather than how everybody and his aunt see things...
@ ferider
I just cannot believe you are saying this... try to impose on yourself to shoot ONLY when the light is interesting, for example early morning, late evening, at night, in the fog, against a strong light source, etc... yoiu just HAVE to discover how much rewarding the B&W is... Use orange and red filters, try exposing just for the clouds, etc, etc, ...you will never come back to colour, haha...
And if all this is not very clear, I recommend you get some (expensive) books for inspiration by Michael Kenna for exmple...