I have accomplished things in my life that literally would not have happened without it. Before org mode I had never been able to find a task management workflow that kept me particularly productive. Just the basic outline features of org mode (with the list functionality to spice things up) has allowed me to comfortably know I'm on top of the important tasks in my life. I'm learning more about TODOs, priorities, the agenda, etc., and it keeps getting better and better.