Truthfully, I don't see it copied that much. I have never even thought about copying it, or if I did, it has never made it to a final design. I guess its just too hard for an average course.
BTW, the new LINKS mag has a neat article by Geoff Shackleford which everyone ought to read. It contains a segment where every part of the spectrum evaluates the 12th at ANGC and it is SPOT ON. I am now a fan of GS based on that one article and think that format - design comments from USGA rules official, competitor, gca participant, superintendent, club member, specator - shows all the differing perspectives that never seem to take it all in as a whole.