I only hike Mt. Wachusetts and Mt. Monadnock in the winter and I like to wear sneakers all year round. I agree it's much easier to wear snowshoes but I'm out for an all around workout.
I find wearing sneakers keeps my feet warmer because I'm using more of my foot muscles to keep my balance, burning calories creates heat. The foot has a lot of muscles and I like to work them all. I don't like using aid to walking.
My main thing is to get exercise, be outside and have fun and I accomplish all that without snowshoes or crampons, although I always bring crampons. I've been hiking with sneakers year round for 6 years now and my feet keep getting stronger, my back and knees feel great and my balance is even getting better.
grog