David, in regard to divot farms, I would think that digital topographics could help to prevent this by working out more complex undulation solutions. Perhaps, Old Tom Morris and Allan Robertson and Alister MacKenzie worked out the solutions to these problems in their heads or by experimentation, and put a pot in only when there was no other solution possible.
In regard to ripples and rumpled terrain, I think, John Connolly, you are right. They are the same as undulations, although perhaps a sub-class of smaller- or subtler-shaped undulations.
Part of getting to know how to play a course is to understand where opportunities and hazards lie even though we are blind to them from the tee. By definition, there is some degree of "blindness" on every course. Some of that blindness is real, in other words we really can't see a speed slot that on later rounds, we know is there. At St. Andrews, there might be some flat ground with a good view of a particular pin position that we are trying to find. Some blindness is deceptive and camouflaged, and created by the architect.