This is how Sona likes to spend his evenings sometimes: lying in front of the iMac. Juku has begun doing that more lately, but it's still rare.
I try to keep my raiding add-ons to minimum to be able to see what's going on with the raid. This is the set up for Sioanda, a paladin. VuhDo to taunt or dispell on the left side and PallyPower to buff on the right, then there are two that don't show: Skada and Deadly Boss Mods. I occasionally look at Skada to see what's going on, but it's usually hidden.
Reea's setup is much like Sio's, but she doesn't have PallyPower (she's a priest, not a paladin) and Skada comes out more often to see the healing/DPS being done. I've seen people replace the default Blizzard interface completely with add-ons, but I like it. Besides, I have a screen big enough to have all that and still be able to see everything I need to.