I am all about the fleece and windshirt combo for winter. I don't snowshoe, but I am an avid Nordic skier and find this is the combo that works for me.
For an in-depth look at this system, go to this link:
http://wintertrekking.com/clothing/insulating-layers/
The short version is that (at least in the dry cold of Colorado, not as familiar with winters in the PNW) is that the fluffy snow is shed quite easily. A wind shirt is breathable and lets out moisture.
I actually use an old school anorak. Complete with a kangaroo pouch. :) Think I paid $20 for it. Similar to this:
http://www.charlesriverapparel.com/pack-n-go-pullover.html
For fleece I already mentioned the reasons why I use it.
But here are some real world examples:
I remember one very cold and dry day in January. My buddy d-low and I were ski touring. His shell was COATED with frost inside. I had a layer of frost from my sweat that had sublimated on the outside of my fleece but was otherwise warm and dry inside. I noticed my buddy started skiing in a fleece after that day. :)
On a recent winter backpacking trip, the old school wool pants, fleece and anorak was amusing at first. Then everyone saw how well it worked. ;)
http://www.pmags.com/winter-in-the-park-andrew-skurkas-winter-backpacking-trip
In any case, the fleece jacket and wind breaker combo works very well in winter. At least for me.
Now, for three season backpacking, I still prefer a puffy layer for breaks and at night (esp with my quilt). I rarely hike in my core insulation layer so the puffy layer works well. Because I do backpack in the Rockies and desert southwest, where it tends to be cooler and drier, I prefer to carry something more compact and lighter then fleece.
Nice to have choices! :)