I run into the room, use my spread out macro a little, and pull the trash mobs.
Basically deal with these, with my tank a little ahead of the other toons.

I have three shammies on my team, but this shouldn't make much difference.
Basically, I refresh each of the totems, with the toons slightly spread out but in the center walkway area.

Pretending we are coming from the south, and the boss is on the north edge of the room...
I run two of the non-tank toons East, and face them North-West.
Then I run the other two non-tanks West and face them North-East.
Each pair of two toons is just close enough to be able to hit the other two.
Their facing is such that they'll be able to hit the boss (where the tank was standing for the trash), but can also hit the opposite side DPS.

The master (and every slave) includes /target Frost Tomb, in their SPAM - CLICK macro.
So when the tombs pop up, that's what they target.
It would probably work better for the tank to not have that in their macro, so they can still smack the boss during that phase.

I use a single Fire Elemental and Thunderstorm on round-robin, to kill trash that gets past my tank.
But otherwise focus on the boss and never manually control trash.

With a pally tank, I switch to shadow aura before pulling the boss.
Basically run most of the way to the boss (activating sacred shield now), then use Avenger's Shield to aggro.
And then run all the way back to the door (and slightly into the hallway), in which we entered... so the boss chases me most of the way.
Then turn around and run at the boss, activating Divine Plea at this point.
Then it is just tank and spank, and try to time Consecration to pick up ads, although that's not overly critical.