Mike, I think of the process of 'dumbed down' as some one, actively remodelling or constructing, easy to play features. Thus, to dumb down a course, an architect must figure out how to take any thought or mental effort to a course by making everything mundane, smoothed out, no vaguaries, etc.
The opposite to me would be little/no architect intervention with features that already exist. The opposite of dumbed down is leave it alone to play as it lays out, with harmony to the terrain, and little construction work to take out features that are challenging, mentally demanding, skillfully demanding, so that a dumb person may get around with little mental conflict. The opposite of dumbed down, is wise or smart use of existing ground features through routing and wise estimation of what exists for the possiblities of golf, and little active intervention to make things easy, smooth or obvious.