Yeah, you clearly know what you're talking about. Welcome to the Mists of Pandaria where Inner Fire and Inner Will don't have a duration. You pop it once and it remains till you die or respec. Its a maintenance, like the Water Shield / Lightning Shield.
For me it is. I am not going to click shit like this. I have it keybound. For three reasons: one, I got the spare keybind cause I play a priest. Two, I CBA to click any stuff I need to click 5x an hour; I keybind that. Three, if I die and get ressed I need to have it active ASAP. For that reason I also have Fortitude keybound. I also have Shadowform keybound 5x on the out of Shadowform main stance bar so whatever keybind I press I get into Shadowform first.If I were going to hazard a definition, Inner Fire is technically button bloat, but in practice is not.
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Warlocks got an overhaul in MoP and lost their choice between Fel Armor and Demon Armor.
Shamans lose their choice between Lightning Shield and Water Shield (ele/enhance gets Lightning by default as passive; resto gets Water by default).
Mages lose their choice for Molten Armor, Mage Armor (what an odd annoying name btw), and Frost Armor and these become baked in the respective spec.
And priests... yeah you guessed it right you're going for the fridge.