Its incredibly effective for getting your work done and staying on point with daily tasks. You can party up with other players and take down bosses by getting your work done. I joined a guild for writers and managed to get my book off the ground and 3/10s of it written (doesnt sound like much, but its fantasy. My goal is 150k words minimum.)
Frostfire20 about Habitica: Gamified Taskmanager, v1.5