Its all in the feel. You can drive in snow, sleet, and freezing rain just fine so long as you know where the "breaking" point is for the car. If you feather the throttle until the moment feel the car accelerating "horizontally", and let off, then you know how much throttle input the car can take before she sends you off into the trees.
Works for me in my S2K, which is a twitchy car even when the pavement is warm and dry as a bone. And I can't speak for the other 370Z ppl on the board, but I've driven my S through two Maryland/DC/NoVA winters with no accidents or anything. Only thing that ever happens is your car getting all dusty from all the road salt.
Definitely not looking forward to that.