I don't like DPSing either, mostly probably because I am burnt out after nearly a decade of playing Shadow, so I too stick to my WHM. Also, DPS classes need waay too many keybinds in this game. Ugh.
Good to hear that I am not the only one. Imho they should have incorporated into the class icon thingy that displays the 2 Manas. We don't really need the red glow when we can use the swords, so they could have used it to indicate dual cast.
It's moments like these that I miss weak auras/power auras from WoW the most.