Winter has shown up here in Wis with temps in the 20s & 30s this week, we even have some snow flurries today so YES I wear slippers to keep my feet warm. Right now while it's still on the warm side I have slip on with just a thin lining but as soon as it gets really cold I'll be wearing fleece line knitted slippers.

I do have heated floors but unless my feet are planted flat on them, my feet are normally cold. During the summer I normally go bare footed.