Los Angeles unfortunately has some of the strictest zoning laws and tightest earthquake codes in the world. Of course LA was a planned city, but alot of it was planned with the auto in mind. Smart growth tends to reclaim the city for the man and not the machine. Aesthetically functional over just functional. Smart growth advocates green spaces within walking distances, traffic calming, waterways, lighted streetscapes, better public transit, hidden or structuralized parking, doors facing sidewalks not vast parking lots, density as opposed to sprawl, using sustainable materials in construction and so on.
So the "smart growth" movement of today is very similar to the "City beautiful" movement of the 19th and early 20th centuries. So we are learning here in the newer cities that a city can be liveable and pleasant, not just funcitonal. Good example: The plan is to eventually unpave the LA river. Why of course! Who in the world would pave a river to begin with?? Aesthetics over purely functional.
One of the greatest achievements IMO to come out of the 19th century movement to make cities more beautiful and liveable was the creation of Central Park in NYC.
And ironically LA has worked hard since the '70's to control its urban sprawl so successfully that it is now the most dense urbanized metropolitan area in the US.