The closest I've been to backstage is the off-site police holding cells.
Was thinking last night how glad I am to have seen the festival through the whole of the last 15 years... the first two years I went were proper old school insanity. We jumped the fences as did half of the rest of the crowd and the whole festival felt like it'd fall to bits at any moment... there were even people sitting on top of the fences with hammers and chisels felling entire panels for hundreds to run through at a time. It was exciting as FUCK, but dangerous... it's probably a lucky thing (for Glastonbury goers anyway) that the crowd tragedies happened at Roskilde and BDO, but it was inevitable that something had to change.
After the 2001 license fiasco and forced fallow year, the next few years were pretty tame. There was still great electronica around, but it wasn't fully mainstream yet and the guitar lineups were castrated to keep the suddenly-much-smaller crowd from getting
too excitable. Sometime during this period the baskets of hash cakes and vodka jellies stopped going through the crowds and, despite it still being a beautiful weekend in the English countryside with some wonderful people; it all became just a tiny bit tame.
Then the storm of 2005 happened. The sun drenched site got destroyed with 3 months rain in the space of 4 hours and it's sunburnt and confused residents either forged on, canoeing through the markets and refinding Glastonbury's mojo within their sodden hearts along the way or went home with their heads dropped swearing to never to return. Stages sunk. Crew got electrocuted. By the time Brian Wilson got onto the Pyramid on Sunday, the sun broke through and tired legs managed to have their first sit down for 3 days, everyone on site was coming back next year. The festival itself almost wasn't ready for the return of the crowd's spirit... thousands of people finished their Sunday night dancing in front of burger vans because their boomboxes were the only things still making noise after the final headliners. I joined a conga line that seemed like it could've stretched the entire festival site.
2007 had another filtering effect. Whereas in 2005, the Weather Gods rewarded everyone for their stamina and loyalty, in 2007 there was no such reprieve. A truly disgusting festival that I'm not sure even the papers really did justice - nobody sat down for 5 days (unless you had the dubious pleasure of sitting in a cell for a bit...) and frankly, the only way to get through was to get completely and utterly munted. So we did. So everyone did. Glastonbury regained a bit of it's "Fuck off, I'd never go to that mudfest!"
Every year since, the crowd and site have grown slightly but deliberately, the festival's started to spread again and it's now big enough to be all things to all people - it's possible to have the Guardian-reader glamping festival, it's possible to take your kids and not have a smackhead throw up on their shoes and it's definitely still possible to forget to see a single band for 5 days because you've been talking to hippies, eating mushrooms and floating in the Dragon pond but more than any time since I started going, it's possible to have four or five nights in a row of blinding nocturnal entertainment... Shangri La and the Block Nine area really feel like a bit of the old festival spirit boiled down into one sordid little corner, it's absolutely wonderful.
tl;dr : I'm still very excited.