This is something I have been procrastinating until I cannot BG while LFR after 3.3.
There are not much achievements left to do while listing in LFR.
Imagine fishing for a few hours in Dalaran is not something fun to do.
Personally, I think BG is good filler while waiting for raid, but Blizzard has just forced players to queue one at a time. I probably end up queue in LFR, fish for 10 minutes, afk and do something else.