I doubt that many people consider cosmetic reconstruction after a disfiguring surgery to be excessive.
Except that she hasn't gone around showing her tits off in 20 years. (if someone has photographic evidence disproving this, I'd love to see it)
When she had them removed, she turned it into a mass media story.
When she had them reconstructed, it was again in the news.
This isn't like replacing a nose that got chopped off. It could have been kept private and nobody would have ever known.
Despite what Susan Komen's minions tell you, breast cancer does not need more awareness.