At least for me, commuting by bike is just routine. Now that my current gig is within walking distance, these about 5 hours of biking per week just disappeared. I think that's because I find biking, running, swimming, actually anything stressing endurance an utter chore after a few weeks. Whereas while commuting a can use the time to spin up my brain and preload the working context. And in the evening it's a nice way to cool down and put everything aside.

I'm trying to compensate by going for a longer walk after-office, but because it's not a necessity I'll drop that far more often than not. I'm a lazy bastard, after all ...