My '00/6spd is now at 77,000mi and I still have 9mm of pad thickness left. Incredible ain't it? I used to have an exhaust brake for about 35,000 somewhere in the middle, but I don't downshift into stops either.
Even though I have plenty of pad thickness, my pads are now making an annoying squealing sound so I'm going to change them for a set of carbomet pads.