I have a motion sensor on my garage fluorescent tubes, and its massively convenient because there are three doorways (side-outside, internal, and a car door)
The sensor means the lights come on no matter which door you enter by.
Downside is that I can be working away on something at the bench, and the light sees no movement, and turns off. This can be incredibly annoying if I'm drilling or soldering, or simply in the corner getting something out of a shelf.
Yes its totally possible to turn the light into "always-on" mode with a flick of the wall switch, but that's hard to remember.
ANSWER Motion sensitive lighting works, and doesn't have to be a separate floodlight. There are downsides too.