I certainly do think what you have described it's a well accepted stereotype, and it may well be true in your anecdotal experience, but I don't think there's been any real evidence that Asian applicants, as a whole, are nothing but test taking, piano/violin playing robots or are as a whole less well-rounded (by whatever measure) than white applicants.

As for your own experience, prop 209 passed in California banned the state, including state universities, from considering race, so you were not judged by any heightened Asian standard like some other schools.