My tuppence worth:
Camped in Oxfields, so had to go through gate B everyday. Was only checked once, but man it was the most thorough check I've ever had. Went through absolutely every nook and cranny in my day bag, and every single compartment in my wallet. If there was anything hidden in my bag it would have definitely been found. I'd been hiding my weed zipped up in a pocket of my pack a mac, which was then packed in to its own little pack. Luckily that day I'd forgotten to do it and had just left it in my shorts pocket! They didn't actually search me so got away with it! Didn't see anyone actually get body searched, so will most likely just do this again in the future.
Was volunteering this year, and every shift had 2 or 3 security guards with us. Without exception every one of them was friendly and helpful. For the first time in my life I was engaging with security instead of actively avoiding them, and must say they did an excellent job.
Didn't see any trouble at all in the festival, thought the vibe was really good, young and old alike.
The security guard I was with one day said the best way to get in to the festival without a ticket was to make a run through one of the vehicle gates during the day (not night)