I think the biggest reason why these macros would be helpful is so people don't jump the gun. It's not as much of a problem as it used to be, but in leveling content especially, if the tank doesn't get the first hit off, there's a good chance they'll be struggling for hate for the rest of the encounter.
Anyway, my macro is:
Feel free to adjust times and markers and text as needed./merror off
Pulling <t> in 5!
/wait 1
Pulling <t> in 4!
/wait 1
/mk attack3 <t>
Pulling <t> in 3! <se.10>
/wait 1
/mk attack2 <t>
Pulling <t> in 2! <se.10><se.10>
/wait 1
/mk attack1 <t>
Pulling <t> in 1! <se.10><se.10><se.10>
/wait 1
/mk cross <t>
EDIT: Also, given how many people seem to jump the gun anyway, I only tend to use this macro sparingly.