I agree on shallow greens. No reason not to create a "Sunday Pin" green where most is accessible to the average golfers with necessary depth, and perhaps one corner is a narrow neck or smaller space for tournament pin positions. If/when located in the Sunday Pin for everyday play, there is always the option to hit the fat middle, accepting a longer putt as the consequence.
As noted on the narrow green thread, Tobacco Road has several narrow greens in many angles. I liked it enough to include at least one "ultra long and narrow" or "ultra wide and shallow" green on most of my projects. However, I feel that doing a couple of narrow greens allows them to stick out as unusual concepts, but more than a few of the odd shaped greens is overdoing it.
Thomas wrote about using long, narrow greens when holes play predominantly downwind, as the golfer can focus on distance control, knowing that the downwind reduces spin, and gives more tee shot distance, so accuracy is aided. Conversely, most players would favor a shallow green or pin position on a headwind hole, knowing that the wind adds to backspin and stop, and I also plan these accordingly, when wind is fairly constant.
I often plan shallow greens with bailouts behind, or with an open front for a frontal run on option. The bailout is no bunker, a punchbowl bank, or simply a level chipping area. Of course, nothing wrong with the occaisional surrounded small target green as different test of golf ability. But, on par, they are too difficult for the players who pay the bills, and not difficult enough for the best players, so why overdo them?
As Forrest notes, any green area with a dimension less than 45 feet in width will likely not allow sufficient area to spread cup locations out, and traffic concentrates, meaning the green suffers in maintenance compared to others. That's been my experience, anyway, and I can't see purposely building a maintenance nightmare for superintendents just to get it narrower (I inadvertantly do that too often to do it specifically on purpose ;D0 especially when most players have trouble keeping all but the shortest approches within 22 feet of the pin on either side anyway!
So, on balance, the really narrow ribbon greens, while neat, shouldn't be overused, as they have some practical problems that are difficult to overcome long term. And if they can't be overcome, they will be remodelled eventually!