If there is so much snow on the roads that my wife feels uncomfortable driving, then she would probably stay at home, therefore there is no point at all in putting winter tyres on her car. If the weather is that bad, you have to ask the question, can you manage with not going out for the few days of snow we actually get? In our part of the country we get bugger all snow really, so as far as we are concerned, winter tyres are not all about tyre performance on snow and ice. Having said that, the way she drives and the journeys she does, means that she can manage perfectly well on good summer tyres all year round.
I on the other hand, travel a lot further in my Passat. It's also the car that we use as the weekend family workhorse. I fitted winter tyres on it a couple of weeks ago and have to say, it feels so much more secure on our cold, greasy country roads. It's the first time that I have every had them, and I have to say I am totally sold on the idea, for me anyway.