On WoW becoming boring...There is just no possibility for anything interesting to ever happen. The game has been boiled down to the very core essence of the genre, and is so foam-padded as to become completely predictable in each and every aspect. There are no epic stories to tell since everyone else is off in another instance doing the same exact thing as you, and there is no sense of exploration as every last detail has been leaked months in advance before the damned content even goes live.
So, yeah - "not this again" is a pretty accurate description. Whenever I play WoW at the end game I basically sit around waiting for something interesting to happen until I inevitably quit, I don't think I have lasted more than 2 months without rerolling or unsubbing. Sadly it has gotten WORSE over time instead of better, as well. No more open world raids, instances are shorter and more boring than ever, daily quests, badges. Hell they even managed to turn PVP into nothing more than a linear grind path.
I just like interesting things to happen. I like socialization. It's sad that I consider EVERQUEST a breath of fresh air. Where someone can come along and give me a buff, or I can SoW a newbie and get a genuine thank you. Where you can kite mobs without them going evade and running back to their spawn. Where you can choose where you can go to advance and not have to follow this optimal set path the game lays out for you. Where you can go into a dungeon and see other people. Where being max level meant something. Where you can talk or group to anyone, and there isn't a city that you can't ever go to "just because", but instead you could eventually go into it if you worked for it (you figure Blizzard would have figured this one out considering they perfected rep grinding in TBC era).