If you objectively think that riding a bicycle with two sets of clothes on your back in the dead of winter is as convenient as driving, you've are either delusional or have never actually been inside of an automobile.
If you objectively see convenience in spending 50k on a car, 30k on a parking spot, and 100/mo for insurance just to be able to pay other marginal costs to be able to go to a store and avoid exercise in the morning, you're either delusional or have never considered how that money could buy you better conveniences.
I'd recommend anyone give it a try if there is a safe way to get to work. Especially in 0C, because it's just not that cold and you don't really need bulky layers. You can get away with just a winter coat or a warm fleece and windbreaker. I dress a little lighter than when I go downhill skiing or snowboarding.
I am still wearing a winter jacket and sometimes an extra layer when I am driving to work in the winter, so there's really no difference from that perspective.