Maybe it's an American thing... I've never seen different coloured bridesmaids over here (I've seen slight variations on dress style though, but in identical colour). Having lots of bridesmaids is definitely an American thing. In the UK women will usually only have 2 or 3 bridesmaids. I still think the dresses were boring though. Makes them all look really plain. Then again, I've heard some brides deliberately dress down their bridesmaids, so as not to distract attention from them.
And would you really want to dance at your wedding to a song by a guy who beat up his girl friend? It doesn't seem very romantic to me!
I'm not against the idea of dancing down the aisle though (and I know what you mean about feeling the love and energy, that is definitely true)... I think it's quite cool. I just think they could have chosen a better song, and nicer bridesmaid dresses!
I far prefer the YouTube video of the couple who danced to the Dirty Dancing theme at their wedding reception.