I love slapping and use it often when playing for fun. I came of age when Larry Graham was becoming widely known and the technique
was central to way i percieve bass. Interestingly, I tend not to do it as much when I play in public. In fact, a few months ago, my wife told me to "let people know what you can do, and slap like you do around the house." I did, and folks really enjoyed it. I then proceeded to do it a bit more, and I think it wore thin. The moral, to me, is that slap needs to be done in context for it to be most effective. Gratuitous slapping gets tired quickly!