I "disable" my minimap too, but unless you go outside the Private Message bubble won't show up in your lower-left corner of the screeen. It'll still show the PM bubble relative to the player's XY position on the map, even though it's absent.
I usually play Unholy Nation, so I don't share the benefit that Zodiac players have. I would prefer the minimap to load in "inside" levels because I mainly use it for PM bubbles.