The only thing I've really minded with ice is the #$%!heads who don't clean snow and ice off the top of their car, and let the wind at highway speed take it off.
Nothing like dodging a board-sized chunk of ice flying at you at 65mph...
For walking on ice, I keep a pair of YakTrax in the car to pull over shoes, and also have an old pair of Swiss army ice creepers for serious stuff.