During cold weather, the oven warms the kitchen when you use it, allowing other sources of heat to relax, temporarily. So that excess heat is not entirely wasted.
I don’t use my oven during the summer because it warms the place when heat is not needed.
Yes, when it’s cold out, there is nothing like an oven with the door cracked slightly to give you that magnificent heat after a loaf of bread has been baked.