This is a dangerous place. I died a view times until I learned to survive and noticed that there are two different kind of Ogres, Snipers and Shamans with differnt behavior and strengths/ weaknesses (to see in their buffs they have in the expanded target window)
EG is ofte full of people, resulting in massive KS and useless PKs.. of course that is fun too for a while :P
It was always relatively empty when I was there. I hunted near the gallows. PK'ers were occasionally in the area, but you almost always heard about them long before they made it that deep into EG.
But dunno if you can ONE-shot in EG for more XP.
Slightly more XP per mob. Depending on level and setup, you can one shot the hangman trees. I could one shot the golems, the trees, seekers, and pretty much everything else, except for the ghouls with the buffs and gear that I had.
Of course this advice applies mainly to mages. I leveled my fighter types in Heine primarily.