Or, indeed, what have you learnt from having played WoW?
Come on, think about it...
To all you people who theorycraft... did half of you know much about maths and spreadsheets before WoW?
Or perhaps you'd never played a videogame before WoW, and it taught you how... and it got you into more RPGs, FPSs, console games... stuff you'd have never tried had it not been for Warcraft?
Or even more deeper, maybe you didn't have many friends before it, and it taught you how to socialize, interact with people...
Maybe it even taught you how to lead a team of comrades, and sorting out disputes?
Problem solving?
Knowledge of armor and weaponry? (I had no idea what Spaulders were before WoW...)
Maybe you met your wife/husband through the game, and it taught you to love (d'awww.)
Or maybe you just had no idea what an internet was, and now you program addons (what a success story that'd be.)
So go on...
What, apart from (hopefully) enjoyment has the game given you over the years?
Edit: Or even that people just suck. Negative nannies!