If you are in arena, even as a healer you’ll probably be asked to do some CC.  While I’m not particularly good at arena, here are my two favorite CC related macros… 

This macro will cyclone my current target if clicked… or cyclone my focus target if shift clicked.

#showtooltip Cyclone

/cast [target=focus, modifier:shift] Cyclone; Cyclone

#showtooltip Cyclone
/cast [target=focus, modifier:shift] Cyclone; Cyclone

This macro will root my current target if clicked… or root my focus target if shift clicked.

#showtooltip Entangling Roots
/cast [target=focus, modifier:shift] Entangling Roots; Entangling Roots