The topic of figuring out "my moment" seems to be the current plague, so I'll keep spreading the disease. One of my favourite blogger Tessy was referring to a post at The Egotistical Priest, and now WoW Insider are doing the same. The original question was "Have any of you experienced your own “moment”? A time when the game changed dramatically for you, and you started to view it differently?".
This was trickier to answer than I initially thought. However, my conclusion is that my moment probably was even before I started to play WoW. I can't say I took it "serious" from the first levels, but I had an idea of what an MMO was about. In Anarchy-Online I had tasted the thrill of raiding and being officer and guild master. Later in Eve-Online I was CEO of a nice group of about 50 players - at that time it was more about organisation and diplomacy than raiding as we see in WoW. So my moment was probably when I realised I enjoyed playing MMOs more than any other kind of game.
One thing though, that caught me already in beta-wow, was that everything was running so "smooth". You didn't get stuck when running around and jumping actually felt like jumping. I've tried many MMO:s during the years and still none of them have the same smooth feeling when running around with your character. I would actually argue that this is one of the success factors of the game.