> Literally no one is doing this, unless you have a diesel engine, you're parked outside, the temperatures are exceptionally cold (<= -10F?), and you weren't planning on driving for more than a day. It's something you'd see on, like, farms or semi truck lots; not houses.

Living in a cold-weather climate, it is the local norm to plug a car (gas or diesel) during winter even if you're only parked for a couple hours. Most cars purchased locally come with engine block heaters installed and most private parking spaces (houses, apartments, office buildings, surface lots, parking garages, etc.) provide an outlet.