So I got a 5 man team, I am currently at Pally 75, shaman 75/76/76 and Priest at 74. The issue is as stated above the healer just loves to run after the tank but non of the others do so I am unsure what the deal is.
My setup: Octopus, Addons Jamba, single 24" LCD with main at full and the drones at the corners running on smaller windows.

Macros/Keybindings/keys:
1 attack (on the tank only)
2 DPS macro (on all toons even the healer which is one of the buttons I press and she runs at me and starts following.)
3 Healing macro (used on healer+1 shaman for when I need that extra healing, normally shaman is casting some kind of dps so she will not always cast a heal)
4 Totems
5 TS, Aggro control for pally
6-0 Reserved for tanking (0 also cast PW:S on tank)
-,[,],= various buffs

f Follow macro/target what tank is targetting/assist
e accept macro/invite group
Shift+Q spread out macro
. priest/pally mana regain spell
Shift+y drink

Num 1-4 some extra healing buttons for the priest mostly and some shaman chain heals as well

So like I said I just start dps'ing and all of a sudden here comes the stupid priest running to me and following like if I had pressed the follow key, the reason I am posting this is because I have been trying to do DTK and the pull of the guys that do the black AOE circles is impossible if I keep getting the healer killed because she just decided to follow me.

So any thoughts? Feel free to tell me I'm an idiot and that its a simple fix, or ask away some more about my setup, not at the computer right now where i have it set up or I have more, that and I have stupid Spyware 2009 malware issue that I need to get off my computer before I take a gun and shoot the computer dead!