Just to make this short:
I came to WoW from Runescape, but I knew about WoW etc for a long time so it wasnt so new to me. I started WoW In June 2005, then I quit 2 weeks later because I found it hard to play and a bit spooky when I was leveling undead.
And then yeah, South Park got me into WOW again and ever since I never looked back.