I have indeed! It's one of the three cities in the US that I know I could live in (the other two being New York and Berkley). I have my suspicions about Boston and Seattle, but am yet to visit them.

I do have to say that although there are more gays in SF, there is a higher concentration in Sydney, so the man was not really wrong. And both cities are bloody hilly, though I;ve never met a street in Sydney I had to walk down on a series of diagonals, as I did one winter's morning in SF.