I go in phases for Warcraft.

I started the game, basically at release.
And was two-boxing, via two physical computers each with a keyboard and mouse (with no hardware/software boxing specific stuff) from the get go.

I saw Ellay's videos, and decided to box the game; this was fairly late Burning Crusade.
Picked up one account, RAF to one of my two.
Then three days later, picked up two more accounts.
Ended up with (A/B = Existing; C/D/E = New).... A > C > D // and // B > E...., RAF chains.
Finished RAF prior to WotLK.

Boxing was still relatively new, so WotLK was fun most of the way through.

Cata seems less fun than previous eras of the game.
But I've also played the game several years at this point, and honestly was close to quitting late BC when boxing made it fun again.

I regularly take 3-4 months off every summer.
That helps to keep the game fresh.

When Blizzard nerfed my previous composition into the ground.
I cancelled accounts and quit, but decided to continue the gold thing until my paid time ran out.

Another composition became fun in that time.
So haven't quit yet.
But my 3-4 month break is coming up in a couple of months.