Dedicated snow/ice tires are awesome, but most people don't need them. If you're running to the pass to go skiing or you live on a nasty hill, then yeah. Otherwise all season M&S tires work great.
Having said that, when I had snow tires on my Jetta I was able to cruise around Bellingham after the awesome freezing rain that turned all of downtown into an ice rink. Going up Ellis towards Lakeway/Holly/Samish I stopped, then passed an OBS on (probably bald) all seasons that was sliding sideways down the hill.