I played at RCD two months ago, and I found that the greens, while not simple, were not the focal point of the course.
They do tend to tilt in only one or two directions, and the edges have Pinehurst-style fall-offs (at least Pinehurst-style at half-height of today's #2 green edges). I found that if you missed a green slightly, the subsequent chips or putts were not difficult to gauge.
Maybe it's just a result of the main focus being the difficult tee shots requiring long carries over aiming rocks, gorse, and whins, or perhaps the greens were always set in the hollows where the flattest ground existed.
To answer Bill's question, I think RCD has been modified no less than 10 times, and there are multiple people on here that have done some research on this stuff.