For the goblin quests, you have to be goblin. For the worgen quests you do not (I raf summoned in there and am the reason it was fixed).Escaping is simple, but never heard of players able to break the phasing and actually do the worgen quests as non worgen just like the goblin area. You can try all you want with summonings etc but it will never work unless you start a new worgen or find a way to cheat the phasing.