The amount of horde players crying on the forum about getting ganked is insane.
I can really imagine that it feels like this, as this didn’t occur to you in 8.0.
But to clarify things up to you, horde still outnumbers alliance, even when it doesn’t feel like it. Both factions are making groups to gank, not just alliance. When getting ganked, it will always feel like you are outnumbered. The difference is that now both factions perform groupped ganks, rather than just horde pre-8.1.
Playing alliance still gets you killed by horde groups all the time