Well, no one I know personally does, but at the shop we had to hold up a brake job for an hour while we searched for the bottle of lube because they were fanatical about that. That and spraying all the pads withdisc brake quiet.
You spray it on the back of the pads so it doesn't squeak against the calipers, and on battery terminals. They're just anal at the shop with brake jobs because every little random squeek from the brakes getting worn in comes back and gets whined about.