Did it for 06-07 and absolutely loved it. A much better experience than I had imagined. The crowd looks worse than it really is. Hardly any drinking and lots of people of many different ages. Loved it. Just booked another trip for this year to do the same thing!
It is true though that there are no bathrooms so sneak a few snacks with you and just a LITTLE bit of water. Oh and dont leave right away because thats when claustrophobia will set in, wait till the bulk of people leave.