Michael:
When I was working for Pete Dye he was just starting to experiment with that idea ... angling a fairway so that the farther down you went, the worse an angle you had to the green, and making you choose between evils. I thought it was an interesting idea, and I've used it in various ways over the years.
However, the bottom line is that too much of anything is a bad idea. The only way to keep players thinking is to change up the ways you test them.