Well, there is this ingenious guy known as Happy Days you can find him on Youtube, and the forums. But he has a farm for AFKing the Moon Lord that still works, really easy to build too, it is absolutely brilliant! He also has a ton of amazing videos.
Yeah, Happydays method is very good, especially if you move the nurse and dryad into rooms just under the lowest teleporter. Though you need autopause turned on to actually use the nurse unles you plan to turn off the teleport timer when you want to heal.