Might sound silly, but I had drilled rotors on a Mazda MPV. That vehicle had heavy front brake bias and seemed to warp rotors all the time. Cross drilling eliminated the heat warpage, but easily knocked the brake pad life down 30%. Still though, pads were a lot cheaper than rotors, and not having your foot bounce on the brake pedal was nice.

2002 X5 3.0 242,000 miles
2004 325i 107,000 miles