Orr used to be packed, that's where everyone was end game. But since Plinx got nerfed, and Fractals got introduced they've all packed up and moved to LA to run the dungeon as its far more profitable.
That's the problem with the game atm, rewarding content is far too localised, it needs spreading out, theres tons of cool areas in the game that are deserted because after you pass their designed level its just not worth going back to them.
They'll have to change it sometime down the line. They did it on GW1 by introducing Hard Mode, Vanquishing, and putting end game quest chains that lead to low level areas.