First, I don't think I've seen a single TS vid from a tank perspective. It's usually the healer's UI you are seeing.
As a pally tank, I use a crapload of addons and every one serves a purpose. You should take a day and experiment. I say a day because many need serious reconfiguration to be what you need. However, the most important addons that I use are:
IceHUD, Bartender, PitBull, Quartz, MiksScrollingBattleText, and CT-Buffs