This isn't wotlk... in cata there isn't anymore stance dances

least as arms, you only switch to defensive stance for shield wall/block and disarm, it's only 10% less damage taken so it's not that gamebreaking, best thing you can do is stay battle stance and keep pressure all the time by staying offensive and getting clutch shield reflects. Also intervene isn't even available at 70
Some macros:
quick disarm:
#showtooltip Disarm
/cast [stance:2] Disarm; [stance:1/3] Defensive Stance
cancel aura bladestorm / pummel:
#showtooltip Pummel
/cancelaura Bladestorm
/cast Pummel; Pummel
switch to battle stance: (switch battle with defensive for the other macro)
/cast Battle Stance
/equip (name of the weapon)
Reflect: (there are probably better ones)
#showtooltip Spell Reflction
/equip (shield name)
/equip (1h name)
/cast Spell Reflection
also make one with cooldowns like:
/cast recklessness
/use 13 (or whatever slot your trinket is in)
/use gloves
there are many others, but those seem mandatory