Oh boy pilots don't like being Grounded

But I bet they dislike being shocked even more

Good Call on that, but truthfully I would install GFIs in all Garage type enviroments. it's common sense as I see it. a Horse for a horse of course.

Tools of choice around aircraft are usually air driven to minimize the possibility of fuel vapor ignition due to commutator sparking or other electrical equipment arc. Article 513 makes a lot of sense since wall driven electrical tools and measurement equipment often find their way into a hangar as well. Even though some hangars have epoxy paint floors or other insulating flooring installed over the concrete, often the aircraft are grounded with a ground lead, so it is important that any wall power driven electrical tools or test equipment used around aircraft are GFCI protected, since a serious shock hazard can exist to personnel operating electrical equipment on or in a grounded aircraft if the power source is not GFCI protected.