Colin, it normally means a FW height slope that kicks balls on to the green, whether behind or on the sides or front corners. Like the Redan, they can provide an interesting shot other than "155 to pin, airmail the 8 iron."
Pat,
You seem to forget that CC have a few of these on every course they design and according to many they do them as well as anyone ever has.
I can name numerous architects (myself included) who also include them on at least a semi regular basis in their designs.
I will agree that not too many golfers understand the idea, preferring the aerial approach. I guess they figure less stuff can go wrong aerially, except perhaps on a windy day. Or, with typically less practice time, they just aren't confident in how they would play it.
Or, maybe, the TV generation has simply lost its creativity and problem solving skills. Maybe the next generation will use their smart phones to help calc the proper angles?