i spent years (since release) being a hardcore raider on the best EU server, on one of the top 10 guild of that server. too many hours, too many plans, too much of life. it was good when i HAD the time, but i don't anymore. since raiding was all that interested me in the game, i quit it in favour of work/studies/social life.
sometimes i miss it, but not too much. i've found offline games are much less demanding