I had an '07 350Z that I garaged from November through March. It never even saw rain let alone snow. I ended up trading it in since I was barely using it even when the weather was nice because I had another car as a DD. I missed my Z so much that I vowed if I ever got another Z, I would drive it all season and as my DD.
I did get another Z currently owning an '09 370Z Touring which I enjoy daily. Living in CT, the heated seats are great on the many days it gets below freezing here. I have summer performance tires on it (Michelin Pilot Super Sport) and have never had an issue with the back sliding out. Granted, I'm careful more during the winter than in the summer months which I think is a common sense anyway. When it snows m-f, I drive my wife's car to work and take her to work. It's only happened once so far this year.
I suppose that I look at life differently now as a senior citizen as life is too short and days are too precious. Enjoying life for me is not a seasonal thing. Though the Z shouldn't be driven in snow unless you have snow tires, it can be driven and enjoyed in the winter months in all temps. Like anything else, common sense prevails.