My UI in 5-mans. In raids it's the same except no party frames.
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Pitbull
TellMeWhen (Deadly Poison Stack monitor, icons below the player unit frame showing when certain cooldowns are finished)
NeedToKnow
Omen (I wish it still had the option to make all bars the same color, except for mine)
Bartender4 (I only click stuff in the top bar. The bottom bar is to see longer duration cooldowns)
OmniCC
CT_Core
Elkano's Buff Bars
Chinchilla
ErrorMonster
The small unit frame to the right of the player unit frame is my focus's target. I usually focus the tank. This lets me choose tanked targets easily and quicky when things get hectic. When mobs are marked, its icon appears here. Raid icons also appear in the name of my target, immediately above the focus target frame, so I can quickly see if the tank's on a different mob than I.
As a rogue often on kick duty, I show the target's casting bar instead of its mana bar. No other text appears on this frame. Damage/healing text, and nothing else, appears in the middle of the player frame so I know when I'm being hit on or taking damage that would require me to move/vanish.
Debuffs appear in a separate list to the left of my unit frame, as icons with names. This lets me easily see if I need to Cloak of Shadows something off of me. To the left of the Deadly Poison monitor I have an icon appear when I get Bloodlust, so I know when to stack with Drums of Battle. At the top of the screen I have icons appear whenever I'm missing poisons or the Well Fed buff.