Douglas - I have played Loch Lomond a few times. It is a fabulous course. Alas, it is some ten years since I played so I can't remember the whole routing. My architectural consciousness was also in its pre-infancy at the time, so I am not sure I can add too much in that field.
The majesty of the course derives, in the first instance, from the setting - a loch, wonderful old trees, and some spectacular mountains. It would have been difficult to build a bad course starting with such fine ingredients.
As you know, the course hosts the Scottish Open annually, to much acclaim, so it passes muster at top level, but also manages to be an excellent, rather than overwhelming, challenge for the amateur. I don't recall being called on to make heroic carries etc. Probably the most memorable hole is the long par 6th which winds along the Loch. On the back nine a few holes are dramatically framed against the backdrop mountains. The 18th is a very picturesque finish along the Loch.
The course is very low and hence has tended to get very wet. Accordingly, it is not a course that favours the ground game (hence occasional grumbles about it being a poor preparation for The Open) so you don't really have a sense that it draws on the traditional game.
I have also played Zimbali - a course he designed on the north coast of Kwazulu Natal in South Africa, near Durban. The first nine is relatively open, played amid the surrounding environment of sugar cane fields. The second nine brings you more face to face with some dense bush that is characteristic of the region. There are a couple of holes there that make pretty severe demands of the amateur golfer. For what it is worth, it is the 19th ranked course in South Africa.