I disagree with the digging out of camp, My experience has been to tramp down a area double the size of the tent.. IE snowshoe across the area 2x's then if possible wait an hour or so then set up camp, this will take care of most of the settling that can happen at night. Doubling up on pad insulation is a necessity, I like the cheap blue foam pads as a base and then my normal thermarest on top of that with my legs on my backpack. A wind barrier can be nice to build as well around your camp, just pile some snow

and build in the trees when possible (but not under them shedding snow sucks)
When you cook dinner before bed it is nice to heat up an extra amount of boiling water, put it in a nalgine bottle and toss that into your sleeping bag (mmm nice and warm). Dry clothes when you get into your bag is a big plus as well. Lots of carbs before bed help to keep you warm as well, don't forget to drink lots of water as well.
It is possible that I could be conned into going on a winter trip.. Hmm the Stansbury mountains have snow on them and are not frequently traveled in the summer, less so in the winter