I have been using winter tires for over 20 years and, as a skier, usually find myself driving on really bad days on some really bad roads because those are the best ski days. My experience has been that snow tires offer better control in those conditions, so much so that I would not drive a vehicle in the winter without winter tires.
Now most Toronto residents probably don't need snow tires for most of the winter because the roads are cleared more quickly and there is usually less snow, lets not include last couple of winters. On the few days when it is too bad to drive, there is the option to use transit, something we in smaller communities just don't have.
Which is why I believe legislating winter tire use on the majority of people who really don't need them most of the time is an unnecessary step, so rather than create a new law, the province could offer a rebate with proof of purchase. I'm not sure if any others have talked to their insurance providers lately, but I just found out my insurance company offers an additional discount if you use winter tires. My rate had already gone down and then it was reduced even more. For once I'm not mad at an insurance company at renewal time.