On the note of avoiding overlapping AoE markers, there is something I have always wondered.

Why do the people that are clustered up and get them all move in the same direction? Just for example sake in an 8-24 man raid, 4 Circle aoe's could come out and no other aoes, and unlucky me I happen to be standing in the exact spot to have all 4 overlap on top of me thanks to the people they are on being in a somewhat box shape around me and partial overlaps on the others. Almost without fail, every single one of us will move left, keeping me in in all 4 aoes. Not even splitting up the AoE circles potentially leading to my doom if don't catch on in time and sprint to get out of the massive overlap, let alone out of the aoe.

Just one of those odd quirks I have noticed when large numbers of player targeted aoe circles go out, and how player groups for whatever reason tend to stay clumped for a length of time.