I commute infrequently do to familial obligations and time considerations (23 miles each way in hilly terrain).

I see the same 4-6 people every day when driving to work and I would likely pass them if pedaling going the other way. I have no idea where they work, but they tough it out in ALL weather conditions. There are a couple (1-3) regular commuters and at least a dozen or so like me where I work that commute a handful of times a month.