Couldn't agree more. I spent almost two full days in one tent (Mattstick knows which one). They just killed it with one full day of Afro-beat and one full day of Bluegrass. It was like a mini-fest of each genre. Though to beat that... that's something they are learning from Jazzfest, I think. If you make one tent a themed tent you will have people there all day. It works!
Having said that, I'm doing both weekends of Jazzfest this year, so Bonnaroo is likely not in the cards. It's Sophie's choice as usual.