I've finished the primary plot quest. Not only that, but I've finished the quest achievements for every zone, so while I may have missed a simple breadcrumb sidequest somewhere along the line, I'm pretty sure I've completed 'every' quest in the game to date.
At this point, my primary objective is to farm better gear, by clearing out elite subzones/lairs for signet drops, and to fill out more notches on the Ability Wheel to increase the variety of builds availiable to me.
Towards the latter end, I'd like to know what questing routes or farming areas offer the most efficient XP/hour. I understand that any quest-based farming route will be on a two or three day cooldown, and thus, know that as I exhaust some routes, I'll need to 'fall back' to less efficient patterns, so I'm interested in multiple options, but knowing the most efficient loops that result in a minimum of downtime from quest complete -> quest giver, and especially those that run through zones with elite/QL10 mobs is the best way to minimize the time I spend doing things with a low rate of return.