Raid Marks on the GROUND!

How many times have you been in a new dungeon/raid and you have no idea what you're supposed to do? The person explaining on vent/TS is hopping up and down and pinging the minimap on the spots you need to focus on. Instead of hopping up and down and pinging the minimap, why not put a raid mark on the ground as a guide. If you get a certain debuff, go here. Ranged players, stand on/around this mark. Melee, run to diamond when this happens...instead of using campfires, flares and faction flags that vanish after 5 minutes and cant be deployed during combat (except flares). I'm not much of a pvp'er but I imagine it could have a wide range of use there as well like marking a trail for the flag carrier to take in WSG. Perhaps adding a click-drag motion to make a ring appear from the raid mark or even make the raid mark incredibly large or an 8 yard radius to designate a certain area.

I believe it would make future raids easier to understand and wipe less with permanent visual aids such as raid marks/areas on the ground.