I used healbot for 2 years and gave the biggest reason why i ditch it, it completely failed in hardmodes. Even the latest healbot where they finally added raid icon support
Healbot doesn't work for me on hardmodes.. its way to cpu intensive. Healbot on 25 man hardmode twin valkyrs dies a horrible death and causes my phenom II 955 overclocked to 3.9ghz to die a horrible death with 7-9 fps.. the very same PC and setup running grid handles the fight at 25-33 fps.. obviously all the eye candy in healbot and UI interractions take up more CPU cycles than grid does and that translates into less heals.
On that fight i have 10-15 targets to rejuv all the time and if healbot doesn't keep up, we die. Perhaps if you're a pally spamming your heals it may not be that bad watching a single target.
btw, love you're generalizations and the fact you didn't read my posts that hinted to my previous experiences
I'm willing to bet that top guilds pushing progression probably require grid ui.. its just good for everyone and light weight enough that it doesn't get in the way - not just cpu wise of impacting performance but UI wise in screen real-estate. Its usefull for any utility class which includes everyone these days.
Healbot was good to me for heroics and naxx.. but i grew out of it for reasons stated, and yes, healbot is sort of a "Freshman" mod - great to get your feet wet but pretty lacking when you push progression. It has improved greatly over the years but will proibably never out grow its "bot" roots
perhaps a name change would help.