I dont think Smartphone's have taken away from the dancefloor/concert experience but they have given the concert/dancefloor goer a reason to look at their phones more often.
I work as an IT Manager and I am in front of a computer all day and I refuse to check my smartphone on my lunch break, unless its an emergency.
I can say, I am the exception these days, I dont have a facebook, twitter, instagram, myspace, 4square. I have not let social media take over my life.
These days if your bored and want to seem important you have folks checking their smartphone's anyway. Let me give you an example, say your that guy trying to pick up chicks at a club. Well, if you have had a bad night and unable to court a female, then the next thing you do is stand around the bar, looking at your smartphone..lol
