I see you meantioned target healing being gross. Just fyi You can mouse-over macro. People will tell you macros bad, and for dps rotaitons that is very true, but for heals, you aren't going to suffer using them because this isn't a game of HPS.
Overall, I would say this game is very different from wow.
Easiest to play : Tank > Healer > DPS
Tank is super easy, the only challenge will come in raiding when working with an offtank. And even then, the game uses mechanics that are obvious for tank swaps.
Healer is all about doing the bare minimum healing needed to live, and doing damage with a basic idiotproof rotation. Damage is so predictable once you learn fights that you can be dpsing 75% of the time.
DPS rotations are overly complicated for my taste. Where wow goes with 4-5 buttons of whackamole that can easily all be tied to one button mouse apps. FF14 has long complex rotations where cooldown timing matters. The enrage timers are normally so tight in savage that a single mistimed trick attack can ruin an entire pull.
All of this is irrelevant though to the normal gamer. The only challenge you'll find is in savage and extremes. Outside of that, this game is best played with a jump in with both feet mentality. You will learn your class as you level it no matter what you choose. Im with Granyala, just dive in.