Speaking more so from a Horde P.O.V.
Having WM on is pointless, It's a headache, for anyone trying to just go about doing their WQ's it's impossible because you have a raid of allies camping your flight paths across the map. I'm a PvPer and I have WM turned off on every single toon I have.
WM started off pretty cool and I enjoyed the occasional group fight which involved no more than 5-6 people. Now it's quite literally 1 Horde vs 30+ Alliance. Every. Single. Day.