Started playing on day 1. First on my server to have a 60 of every class (played Ally). My main was a Pally raiding every day and my guild had many many servers firsts including MC clear, BWL clear, AQ20 and AQ40 clears, Naxx clear... we were far and away the big guild on a small server and that made for a laundry list of accomplishments for us. I slowed down and finally quit during BC.
After a couple year hiatus I went back and played some more, it was just plain stupid how easy they made the game, they eliminated the need for hard content that took time and teamwork and just changed it to everyone can get everything with no effort whatsoever. I hated the lack of challenge the newer version of the game had so I quit again relatively quick. It took months for the first player to get to 60, now a player can go from 0 to max in a couple of days. First MC clears took 6 months, now the biggest dungeons are down less than a week after coming out, it's just dumb. I do not regret my time it was entertaining, no worse than people who watch TV or movies or other couch potato stuff.