For just ice? Riding powder they are actually pretty good to have. I ride a ton of powder and you just never know where a hidden rock is going to be if you take a tumble. Then again, you can say that about any of the conditions, there is always that "if". As you said it is personal preference with the OP. Helmets are never a "bad idea".
I wish I could ride powder...I should move west
If the thing is comfy, I might wear it everyday...I just never tried it!