So you talk to the waiter about what wine he recommends. He brings you a bottle from a local vineyard. Then, rather than converse with the waiter any more, you whip out your iPhone and snap a photo of the bottle label to get more info. I'd prefer asking the waiter.
You're wandering in San Francisco and see the large pointy building. If it were me, I'd simply ask a passerby if they knew what it was. But instead you can whip out your iPhone and take a picture of it, and let the device tell you.
It appears from this video that we as a culture are becoming lost in our technology, completely reliant on it for the simplest things. I can see it being useful to people in a foreign country who don't speak the language. But casual use in your own country (or a different country when you know the language) seems like overkill. 😕