You do realize that pretty much no Alliance is running around in a raid, right? You can only do the assaults, world quests, and other PvP quests in a party.
So you’re simply running into several parties and/or individual players. Not only that but you can do the same back.
The issue is you we have a ton of people who are truly PVE players and only doing world PvP for easy rewards. On both sides. The alliance bonuses are strong enough now that it’s bringing those PVE players back and they are clumping like lemmings. Just as the Horde players did when the Alliance was outnumbered.