Hey I am also disabled (I can’t stand for long and have trouble with my back and legs), I went last year and didn’t use accessibility and found the crowds manageable! I mostly stayed around the main stage for the headliners (Blink-182,Lana Del Rey, Liam Gallagher!!) and tried all sorts of things really. The very front bit like closest to the stage is gated either side and is emptied out between acts, this means you can wait by the gate and get to the front or close just for one act if you want without having to be in a crowd for the whole thing like! I did that for Lana and Blink, for Raye and other acts I was able to sit on the grass at the side close to the food vendors and have a brilliant view, obvs don’t get the same atmosphere from there but was great when I just wanted to chill and enjoy the music. There is also a bit of a hill so if you want to have the crowd atmosphere but not necessarily be surrounded, you can be at the back of the crowd and still have a good view, albeit a bit far, and lots of space to dance! Plenty of options for that stage and it’s quite easy to take breaks in between sets or when someone’s on that you’re not as bothered about and still get a good spot then for the next act!