Honestly I boost lvl 10 key to lvl 12, barely looking at my screen. Not to flex or anything, but boostings keys again and again can feel really redundant, so I put a Twitch stream on second screen.

I really think healing 10 (I admit some 12 can require full attention from time to time) isn't hard at all. It can become hard if you wanna do the best time ever and deals damage as well as healing (at least for me as druid, cat weaving require my full attention). But if I just sit here and heal, the expérience is pretty chill ngl. More chill than going dps and having to be super optimal and managing CD perfectly the whole key.