In their new house, my parents put those remote controlled fans in the spare rooms we'd stay in. It's controlled by a switch which is an all-or-nothing. When I stay here holidays (out of state) I prefer to have the ceiling fan on at all times because the room is usually several degrees warmer without it. So to leave the fan on but light off when I'm not in the room, I have to find the remote...that they refuse to mount on the wall in the small case it came in.
In my house, the fans are on 100% of the time in my master bedroom and the living room. I rarely turn on the light in the living room because it's super open, and the TV is always on, the kitchen is completely opened to the living room and on the opposite side is floor to ceiling windows. My bedroom fan has constant power to the fan so that's always on and I sure the light switch.
The last few times the fans were not on is when I lost power.