After I caught the fish I needed (old ironjaw) in ironforge last year I stopped multiboxing fishing because who wants to fly from pool to pool to get off one cast from the whole team? I wasn't playing at the start of 5.2 but multiboxing fishing is suddenly worth it in pandaria again because of Fish of the Day.

Fish of the Day is an area of intensely spawned pools somewhere in pandaria and with one giant pool that will take your team a while to fish out (an elite spawns afterwards). I didn't happen to hear about it until a couple of days ago so I thought other people might have missed the memo as well. Ben the fishing trainer in halfhill will tell you where the days FOD is happening.