It depends on the climate. If you live in California or west coast outside of rainy seasons, there really isn't much of a problem unless you have a huge hill to climb on the way to work. Actually, that was my problem in Lausanne (3D town, I road up the hill every morning, and would be a bit sweaty, but I had my own office so I didn't care).

Riding worked for a particular phase of my life, now it doesn't, since I have a kid to take care of and the bike theft problem has gotten out of control in my locale.