This is the Alliance strat for world PvP. It’s nothing new.
Whenever there’d be a 3 man group roaming around killing people, they’d start a 20 man raid to farm and camp them. Then more Horde would randomly trickle in. Eventually, they’d get bored and leave. I witnessed this twice last night in two different zones, and it’s probably a pretty decent way to farm honor.
Alliance perfected the zergrush, look at their AV victories. If more people on Horde actually have WM on, they should be using these camps as an opportunity to form groups of their own, fight back and farm honor in the same way that they do.
I’ve tried to get similar groups up for Horde to fight them, no one joins, no one cares. Even when bounties are up, they still don’t care. Until the Horde actively tries to counter this behaviour, it will continue. Such is the way of War Mode.
Either stay away from The Maw with warmode on, or come prepared.