Some observations:
After we left the JW's my wife and I attended an independent Evangelical church. The music there was very much like what's in this video. It is very easy to get caught up in the emotional rush. In fact this type of music is designed to do exactly that. You can call it "uplifting" or you can call it manipulative -- either way its more fun than anything I've ever seen or heard at a Kingdom Hall.
Secondly, it strikes me that about 99% of that audience looked under the age of about thirty (and at what my granddaughter would call the upper end of the hottie scale). That is also deliberate these big churches are doing whatever they think it will take to appeal to young audiences. The Watchtower has fallen flat on its face in this regard.