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I just turned over 60,000 miles on my 2005 Z51 with the original brake pads. Because of other posts on this forum citing replacement at lower miles and experience with other vehicles (non-Corvette) brakes going out after only 30,000 miles, I decided I would replace the brakes. I was amazed to find all the original pads worn nice and evenly and 1/8 inch of pad thickness still left on all the pads! My guess is these pads would have been good for at least another 10,000 miles. Way to go GM! These pads would occasionally give a low pitched growl under certain braking conditions, but I never found this to be a problem.
Good news. I'm sure you are easy on the brakes as I am. I had a Firebird that I replaced the front pads at 60,000 miles. I hope I'm as lucky as you with my C6.