I switched to toe clips after having my feet slip off the pedals in the rain coming off the front position at a stoplight TWICE in one day, with a truck behind me both times having to stop suddenly to keep from hitting me. I decided keeping my feet on the pedals was an important safety issue.

I did switch to SPD later, but I'm not in love with them and right now I've got the platforms with toe clips back on, even though most of the time I'm still riding with shoes with SPD cleats on them.