Half a dozen falls in 18 months is a lot! I'd be scared, too. Is it always ice related? Is it always on the same bike?

Because you haven't sustained serious injury so far is no reason to convince yourself your fear is unfounded. You've been lucky. You hit your head! I'm worried for you!

Also, those things you've mentioned that are making you feel like a wuss (not going through puddles, and slowing down to 10-12 miles an hour) are how you're supposed to ride on ice. Those are good bike skills. That's what you're supposed to be doing. It will add time to your commute, but if you were in a car, your commute would also take longer. Ice deserves your respect.