I make liberal use of the "Report player AFK" feature when I'm in Battlegrounds, particularly Alterac Valley. I can't stand AFKers who leech XP and honor off of the rest of us actually trying to win a game. But while I also abhor when one of my fellow Hordies caps Snowfall Graveyard (don't get me started on that), I would never consider reporting him AFK in retaliation. Sure, I don't want to play with him anymore, but I wouldn't abuse the report AFK feature to try to force the issue either. Others, it seems, are not above AFK reporting abuse.
There have been a couple of times that I've died and run off for a biobreak only to come back to being in town and a deserter debuff. That's kinda understandable: I was actually AFK. But just how quick are people reporting? It's like being at a stoplight in New York City, where people start beeping their horns to hurry you up before the light even turns green. And then the other night, I was trying to get through a bottleneck near Stormpike Graveyard -- which admittedly wasn't the smart way to get around -- and next thing I know I'm at a loading screen. Obviously, I got reported for being in the group of people fighting on the road; but since I was just trying to get through, I didn't get rid of the debuff.
Here's how reporting people AFK works: