Revolution? Drinking the kool aid much? My team has it. We've had it for a month or two now. There has only been a handful of posts and most of them are "TGIF" posts.
I realize you're skeptical too, but I'm saying I wouldn't even go as far as to call it a revolution. Call it a trend if you'd like, that's giving it too much credit.
As you can tell from my post which states that Slack doesn't offer anything unique or special, uh, no, I'm not drinking the kool-aid.