I'd say more the opposite; when driving alone I have ideas that pop up and sometimes entertain, I can rehearse conversations or thoughts out loud, because of the privacy, and maybe the fact of having the other half of the brain focused on the road. I don't recall doing much of that in my mind when taking the subway or riding a bus, especially since I was already expecting the moment to combine stations or walk away. It did however, bring a different sense of freshness to start my workday, already with some physical activity. Fun drives or going on walks intentionally, not as part of the commute, hit different though.