Momaganon and Lothranis are the spawn points of the epic world bosses, which drop a considerable amount of coins, tokens etc. Now these locations were meant for parties to farm the bosses , but a decently geared farming class could solo them pretty easily which lead to a lot of boss camping by higher geared players who could afk and macro a boss to death depending on the class.
To counter this it was made into a pk zone so the bosses are not just free camp-able kills, with the same mechanics of nightscream so you cant respawn on the spot. So id say get a few friends to help out when you farm these bosses, or if you are still in starter gear there are still many other ways you can farm ec, tt 2-3/3-3 , cardbosses, bh on a million alts etc. Or you could try the bosses in chrono world they drop less stuff but you wont be killed in bluename.
As far as questing is concerned I guess just cross your fingers and hope you don't get spotted and get ready to holypath if you do, the plus side you don't drop anything if you die there I guess