I was a massive fan until around 2009/10 but much more causal now. I'm more interested in the business side of their music industry rather than the artists themselves. I was huge on DBSK - I guess my love of Korean pop died with the lawsuit which resulted in Micky, Hero, and Xiah leaving the group. But I still follow Hero's career: he's turned to rock now and it's amazing.
I did see BIGBANG live in December 2012 though. The energy they have live is immense - it's a much different atmosphere to hearing any UK/US pop or rock artists.