The Astral Plane is a place of cosmic peace and serenity, a realm of gentle mists and alien but not unfriendly stars. Mortals who access it do so only after reaching a pinnacle of spiritual development and enlightenment, where those who have reached the peak before them may ease their transition to a higher state of existence.
However, immortals have an easier time of things, which can lead to rather less enlightened conversations.
Spoilers for S8E13, "The Mean 6." Rated Teen for discussion of realities that are rated Mature.