I travel for a different festival each year, and the wait is a killer, but for Glasto it's been worse, lol.
This is my first fest buying tickets without seeing the lineup, so it was several months of waiting, and then now we get a part of the full lineup and I've been just listening to the artists announced compulsively since then.
Luckily my local festival that i go to every year usually releases their lineup either in spurts starting around now, or entirely in the beginning of April, so hopefully that'll give me some relief, lol.