I also use the mic from time to time, when I'm dj-ing here in Germany. But I speak on german, not english. I don't quite get, why it should help to create an atmosphere. When I say something,which doesn't happen too often, I want the audience to understand it, so it's probably easier in our own languages.
By the way, for me king on the mic is Dave Rimmer, I never understand anything, but he gets the floor buisy, when he shouts into it.
best, Martin