My first MMO was MapleStory back in 2007 or so. My dad introduced me to it and we would play it together a lot until he got sick of not being able to leave level 32. I tried playing it longer, trying to get out of level 18, but I just got bored.
I started playing again shortly after the big bang and I had a lot more fun with it. I had a nice schedule of play it for 1-2 months, then stop playing for 3-6 months, then playing again. I did that steadily until I overreacted about a SAO event and stopped playing. I'll probably be back at it in a month or so.