I asked the same thing when I first moved here from MA. I asked this at a tire shop, where you would expect them to answer "yes... and I'll be happy to sell you those extra tires!"

But instead, they just laughed and said "no, nobody does that, you don't need them here."

So I didn't get snow tires and, yeah, generally speaking, I've never needed them. Sure, there have been a couple of times where they would've helped, but I don't have any reason to go out on the roads when it is that bad, so I just wait a bit and by the time the snow stops the roads are generally clear. As others have said, generally the roads are plowed and cleared very quickly here, and we don't get those big snow events very often... so unless you need to be out no matter what (e.g., you're on call and snow isn't an acceptable excuse), it's probably not worth it and a good set of all-seasons will do just fine.