The short answer is, yes, they definitely do. The biggest and most recent example might be Ed Sheeran which relies heavily on looper pedals in his live performances, and he does it just perfectly. Les Paul has also used them to great success and they have been an important part of his arsenal. Other notable artists include The Edge of U2, Pat Metheny, Brian May of Queen, Robert Fripp, Reggie Watts, Mal Webb, and so much more, the list is pretty much endless.