BS!!!! People like Apple's stuff because it works!!!! Sexy is what you read from reviewers and bloggers. Their stuff effing works as advertised. I have the 2008 Al unibody macbook and it has never and I mean never crashed or gotten a virus. Knock on wood that none of the electronic parts have failed but that will soon come because sh** don't last forever. But so far this effing laptop is amazing!!!
I expect this depends on your definition of crashing. Having to force quit an application because it has stopped responding, does this count?
Don't get me wrong, my last two laptops have been MBPs and I've enjoyed using them both, would recommend and purchase again, but yours has not crashed in three years? You're either exceptionally fortunate, or you've not used it for two and a half of those three.
On another note, the public embarrassment factor will go away if the 4S reaches 'critical mass' and if people are seen to be using it in public. Much like, I suspect, the original mobile phone. I must confess I can't remember the introduction of the mobile, however I wonder if people felt self conscious (or perhaps just incredibly smug, a la Wall Street?) using them in public at first?
Get enough people using this feature, and it'll become the norm. Admittedly, this is a circular argument, as you still need to convince the first adopters that they don't look like fools speaking commands into their phones, but there you go. All that would then remain would be the privacy angle.