Currently I'm leveling through the story in ARR and am planning on re-rolling a Dark Knight once I unlock Heavensward. I was just curious how daunting the grind is starting back at level 30 again. If it's really that bad then I may consider just sticking with my NIN through endgame.

Side Note: Since I will have all the main scenario quests finished when re-rolling what is the fastest way to level? My guess is Dungeons/Levequests?