I saw that too. I'm going with the toggle only but that duplex one is basically the same idea. I noticed that some of these sat not to use with CFL or LED but I think the pilot light versions are all ok.
Most of the pilot lights are NE-2 neon bulbs connected between the switched side and neutral. You can add one to an existing switch for a buck or two.
I thought about adding something like that (some kind of a small LED bulb inside). But, I like the idea of having it integrated into the switch. Appreciate the suggestion though!
FWIW, I was going to install a motion sensor/light detector light outside and put a guard over the switch (I have done this in my shop for a similar usage). However, after testing, I found that the heat pump which sits right outside the door prevents this from working. Whenever the HP goes into defrost mode it sends a plume of steam into the air and the motion sensor triggers. Since this light is also located just outside of where my primary TV is located with a big window next to it, every time the motion sensor triggered, I got shined in the eye. I immediately reverted to a non-motion sensor setup...