Recently, me and my friends went to Hyjal (using chopper method), we came across two people also trying to get there. We decided to prevent them from doing that and used mind control (my friend is a priest). Then we tried to use MC to get into Hyjal and we succeeded, I got into Hyjal. I.e. we got to the place where you usually use chopper, priest MC'ed me and entered Hyjal. I haven't got "No mans land" debuff and was able to move in Hyjal
http://www.youtube.com/watch?v=HgpHLXazrqo