You're getting home with the groceries, you have both hands full, a cat that's trying to escape, and you need to get the lights on. What's easier? Fumbling for

You're getting home with the groceries, you have both hands full, a cat that's trying to escape, and you need to get the lights on. What's easier? Fumbling for the light switch, or saying "Illuminate" when you walk in, and "Deluminate" when you get to the other side of the room and get into the kitchen. Or you're chilling, watching a movie, and you want to pause and get a drink. Your eyes have adapted to the darkness, so turning the lights directly to on is going to blind you for a second. So, you have the lights slowly turn on, and you can see without getting that flash of blindness. There are all kinds of interesting things that having finer grained control of lighting lets you do.