I haven't had a mishap this winter, largely because I'm staying on studded tires. I had a fall last winter on my regular commuter trying to slow down on an icy hill.
Still, the big thrill this winter are those hard packed snowy streets right when it's about ready to turn to slush. The front wheel nearly loses it when you hit a more solid lump. I don't mind the rear wheel fishtailing a bit, but a fishtailing front wheel is usually not good.