FWIW, I earlier had an analog planning system, but it wasn't scaling. With a new job and changed roles/responsibilites, Org mode gives me the productivity I was looking for.
The past 2 weeks since I have started using it has given me positive results. But I will wait for the year to give a definite answer :-).
Fantastic way to organise things and has a built in diary. Definitely recommend it to fellow vim habitators.