Make a macro!
"Attention: Blessing and Kings and Mark of the Wild no longer stack. Blessing of Might provides 10% AP (which doesn't stack with Trueshot Aura/Abom's Might/etc) AND 92 MP5 (which doesn't stack with felhounds/Mana Spring Totem/etc)."
Second (optional line)
"If you have MOTW, I will not buff Kings. If you have a 10% AP buff AND a 92 MP5 buff, I will not buff Might. If you are missing one or the other please feel free to say so. "
It gets annoying to have to explain it over and over again to people that apparently never read tooltips, or for people that didn't realize pally buffs changed. I remember a druid complaining about not getting Wisdom when he had Might. Poor boomkin, so clueless. >.>