personaly i put shift and ctrl on my mouse and i separate my skill by form and utility.

on first bar i put dk-twin-snap-tod-shoulder tackle-mercy (so its the basic opener with buff debuff)
second bar(shift) : bootshine-true strike-demo-fracture-steel (back attack)
third bar(ctrl): destroyer-one ilm-rock breacker-elexir-howling- (aoe)

all my buff like mantra,blood bath-second wind-infernal-bfb-evingorate-meditation-perfect balance etc are on q-e-r-t-f (+shift and ctrl of those on my 2 other bar).i also do the same with midle mouse (using change form,
purification and tornado kick on them)

its clean,everything is near and its easy to follow rotation.i do those keybind on every game now.i have lot of button on my mouse(corsair vengeance m95). i could set more on it but i didnt feel the need for ff14.