I've been reading the original book by David Allen and have slowly started to integrate GTD into my life the past couple of weeks using Omnifocus + Google Keep, and it has already made a considerable improvement in my productivity. I've had problems with procrastination as well, but with GTD I see myself wanting to do stuff.

It hasn't been "life changing" so far, but I almost know that it will change my life once I start practicing it rigorously.

Also, will definitely check out your setup.