Its dissapointing they nerfed this I feel it was intended to help players level alts to 100 for legion but shrug.
Im still doing this as im not playing wow untill legion comes out at this point , I am leveling 2 alts casually from 10-100, just on another screen while do other crap.
Its terrible xp but considering you are afk its still worth it , I have 2 alts I just fly back and forth between westfall and dun murogh.
They are sub 60 so at 60 ill consider actually flying them around to invasions , but if you need to get to 60 you can just fly between westfall and dun murogh , thats the only interaction , just let them stand at the flightpoint , if you die you still get xp.
You could also do this at barrens \ azshara the zones are closer so the shorter flight time may be better.