If memory serves, I believe that when they reconstructed the Seawall on #18 a lot of faux rock retaining wall was used. I was dissapointed that they didn't continue it up to the bunker, as I personally don't care for the straight edge (as, yes I did notice it from the tee) although I deplore the fairway bunkers even more.
However, I believe the Seawall work was undetaken as a Restoration project, as opposed to a redesign (and I wouldn't be surprised if their hands were tied by some CCC - CA Coastal Commision - regs as to what they could do). In that light, you have to agree that they did a wonderful job replicating what was there with modern technolgy.
This is a good example of what Architects face when they get nto a situation where what is already there might be better if redesigned rather than just restored. While some, it seems, want things to be black or white, sometimes things are a bit more grey.