SE shifted alot of the focus to group partys (XI style and dungeon grinding) and quest based leveling. With party play being the fastest way to level up.

They actually nerfed Leves to get people away from that being the primary focus of the game.

The dungeons at least the 45 one is giving like 200+ sp a kill so that is decent for leveling, I assume the lower one would be as well if you are at the right levels... I am to high to really tell.

All the quest are giving SP, main story quest are giving over 15k sp per quest in some cases