Myself, I've been boxing (meaning hardware or software key replication, etc, and not just multiple accounts moving between keyboards) since late Burning Crusade.

Many of the current regulars were boxing warcraft (or other games) before me.
But the majority of the regulars play or have played a significant amount of time as a warcraft boxer.

Having done the entire WotLK expansion...
Cataclysm is not that new or shiny.
The game is not horrendous, but it has lost a large portion of its allure.
But someone else, who is newer to the game... might like it a lot more.

And I have taken four or five breaks before.
As long as five months.
Usually something piques my interest.
So you never know.
Same for others, you never know.