You have multiple zones to choose from each with significantly more quests than you need to be able to switch to the next area tier. Plus several low level dungeons. Escort quests were never a viable activity up until a few months into the game when the number of characters levelling dwindle. Right now, most players are concentrated in low-level zones.
What I too have experienced is apparent layer imbalance. Twice I have been switched from an empty layer to a packed one. This is something Blizzard can fix. But it won’t be easy, because it would require more frequent forced layer changes, which can break the experience as well.