I'm very lucky to have played Eden and Short at both TOC and NGLA. FWIW I preferred the Eden of TOC to NGLA. TOC's Eden is absolutely terrifying in competition and one of the most difficult shots with any significant wind. Into the wind its almost impossible to hit it hard enough to even get to the green and overclubbing and risking going long and having a downhill and downwind pitch can bring 5 or 6 into play.
Downwind it is as precise a shot as you can imagine trying to just clear the front bunker while holding the green that despite its tremendous front to back pitch is very firm. You seem to always end up above the hole and two putting almost always means holeing an eight to ten foot second putt.
NGLA's Eden is beautiful and I think MacDonald felt his forced carry over the small ponds was an improvement over TOC as TOC "allowed" a topped or running shot to escape any penalty. Overall though, the original is far more terrifying and memorable.
However, give me NGLA's Short over TOC's Short any day. #8 at TOC has never done anything for me. I know the simplicity of the tiny front bunker and the enormous, seemingly impossible to miss green are supposed to sneak up on you but it just seems a bit bland to me 
Maybe before yardages it was a sneaky little "fooler" hole but now it's just a way to go from 7 to 9.
But, at NGLA the tiny, downhill Short is one of the coolest, most interesting greens I have ever seen. Many greens within a large green that does a much better job of allowing one to get careless with such a short iron. In this case, MacDonald vastly improved upon the original 
More proof that you and I think a lot alike.
Par 3's are the least strategic of the holes, and with the predominance of aerial play, there aren't many options to be contemplated.
Pat,
I agree with you to a certain degree, in fact I think this is a major problem with most modern part 3 holes--the lack of certain strategies--and the lack of ability to dictate those strategies to something else other then a carry nature. But to me that is the beauty of the "Short" hole. The carry over the moat is threatening to some; its deep and troublesome, but the contours on the green that go with it--well they are the strategies with-in--like the layers of an onion.
The "Short" hole at NGLA, (as well as the NLE Sandy Parlour) Riviera #4, (A modified Redan) the 5th at the Valley; as well as the original Eden itself, allowed me to further learn that strategies for one-shot holes should exist on the green, and that the parts of the holes can get you there--to the target--which in the case of a one-shot hole is the pin and the hole itself. Thus my one complaint--my one disagreement with Charlie--the 12th at NGLA.
I think half of the charm of the Eden hole is exactly as Chris Cupit has written it above. It's a devastatingly beautiful, threatening and deceptive golf hole that gets in your face and will kick you in the nuts if it is given the chance. The 12th at NGLA doesn't do that to you. Its a completely different golf hole. Don't get me wrong, I love it and the setting, but when it comes doesn't come close to the original. In fact, I think Garden City's 18th is a far better representation.
This all to me is what makes a GREAT one-shot hole.
Also, I think that when it comes to architecture that one-shot holes are the toughest which to design, because you have so much less which to use when it comes to ground for strategy. The strategies become condensed with-in the putting surface itself.