I've adjusted to it and use it still, i've gained well over 20M exp using the EOC system, but I still prefer the old system better. When using the EOC for bossing, it makes it much harder since you have to click attacks and food, and prayer, and if they have an AOE attack, you have to move around.. It's just annoying. Things that are easy like Barrows - I used to love going there and doing the minigame and talking to friends at the same time. Hard to talk to friends while facerolling the keyboard to kill Ahrim.
If the pre-eoc servers don't come out, I won't stop playing, I never have. But if they did, I would definitely play them. A little nostalgia now and then is a good thing. And I severely miss how the old game was.