I doubt too many planners are into feng shui practices but it is quite interesting how it is used in the rest of the world. Anyone who has tried applying the ideas to their home usually experiences some sort of improvement, whether the beliefs are actually true or if it's just that one's environment truly does affect their mind and well-being (completely believable).
Feng shui outside of the home environment has everything to do with the topography, design and planning of building and cities. Many Eastern cities have been designed according to feng shui guidelines such as Hong Kong (the most famous one). One would have to agree that Hong Kong is a very pleasing city with an incredible skyline.
I think that the thought of combining feng shui with urban design and planning in the West may be an interesting thing to do. The only problem would be finding enough people living in one area who are into it