The LFG channel was entertaining, especially when doing something boring. The only time I turned it off was during raids because that was just a bit too much spam.
I'll miss having a global chat channel, I enjoyed it. It always amused me how the people who constantly complained about the chat cluttered the channel just as much as the chatters themselves.
Never quite understood why people who got so angry about the chatting didn't just move the channel to another window and hide it when they weren't actually looking for a group. I'm sure someone will claim that the chat impeded their ability to find and form groups, but I never had a problem.