It's interesting to me that Tom Doak mentioned MacKenzie trying too hard to utilize a natural feature multiple times leading to some cramping in his routing.
Last April was my first visit to ANGC, and although I was wowed by the greens and the beauty of the property, I recall writing here that I left unconvinced that the routing was as good as it could be, not that I could do a better job.
It seemed to me that in going straight up and down hills, rather than utilzing more side slopes, MacKenzie ended up leaving a big under-utilized area of the property near the center, and instead ended up working himself into the corners, and then trying to get out. Of course, when it worked, as in "Amen Corner", it came off as brilliant. However, I'm still unconvinced that other areas of the course just don't have way too much going on simultaneously in a tight area, especially for such a sprawling property. You can get a sense for what I mean standing on the 6th tee, or the 7th tee and green (even the old one), and overall, I find it to be a course that is elevated by the wonderful set of greens and the creative, heroic use of water hazards as a feature.
For instance, there is no better or more creative use of a creek in golf than 11, 12, and 13. Still, those holes could have been found with any number of potential routings.