The only thing that is difficult to do on controller with default settings is heal people outside of your party while in FATEs, which is far from the end of the world. You can get around it anyway by making a macro with the line /target <tt> and hitting that while targeting an enemy will swap you over to their current target. You can also customize your target filters in the config menu so you can target players with left and right on the D-pad by hitting a button combination.

Healing other players is very simple when you are actually in a party, as you just have to hit up and down to cycle through the party list. You can sort the party list too so you can put stuff like tanks at the top or bottom so they are easier to get to.