Ian, Happy to hear you're enjoying the Tyros 4 very much, it is quite the beast that's for sure.
Bill, I think with many of the demos they've over done them by a long shot. At least for my taste. As been mentioned if they are used sparingly they add a nice touch. Out of all the voices on the Tyros4 I probably use the shoo bee doos and the doo wops the least and that's all because of the style of music I'm playing. You know mostly what our elders would have listened to........or maybe our grandparents. LOL