Great to hear from other winter riders!
My bike ride into work is pretty short so those with a longer commute might not enjoy it as much, but I love my fat bike in the winter. The ride to work this morning was 7 degrees F, god knows what the wind chill was...
With the 5 inch wide tires traction is never a problem, even on straight ice. The rolling resistance is higher, but who cares, just a little better workout on the way to work.
The only big issue I need to work on is keeping my fingers warm, I am wearing the heaviest winter gloves I own, but fingers still freeze. Definitely need to switch to good mittens, maybe something with down insulation. Operating the bike would be slightly harder, but workable. Also need a reflective vest now that it is so dark in the morning, I would use lights but every light needs to be brought in the house or the batteries won't work due to the extreme cold. So I will go with a reflective vest instead so I only need to bring in and out the headlight.