I tell you, I am a main PLD and I am a sloooow casual leveler. I played from October to January, lots of weekend nights, a couple of hours here, a couple of hours there, to get to L50.
And... I still haven't finished the pre-2.2 main story. I am sitting on Castrum Meridianum and the Praetorium... because I just can't stand the idea of taking those on, through Duty Finder.
(I've watched a *lot* of game film; especially on CM, and even on "one-tank" CM runs. That's a LOTTA work for the Tank

)
I am so wary of trying to finish the main story as a PLD, I'm running up my CNJ/WHM levels, thinking about finishing the quest line as a Healer - because it's sooo much easier and lower-pressure.
(Enter our healer partners crying "No it's not!" stage left!)