Quite frankly you'd have to be asleep and have pulled two dozen mobs for anyone to easily gank you, if you've got decent PvP gear. I was attacked by four people when I was killing Kal'tik the Blight and I managed to get 2 million health off him before I made a mistake and stepped into his Blade Flurry and died. I also killed Major Nanners yesterday with two players on my ass, had no problems (although one of them died after a while to Nanners' Going Bananas).
You'd have be nuked by a fully raid geared super DPS while you're so distracted by your mob killing that you can't fight back, in order for it to be an "easy" gank.