Author here, thanks for your in-depth comment. I will have to agree that Step 6 is sometimes the first step for me too, the passion of a new idea can be overwhelming. However I do try to get it onto the board as quickly as possible, this way I can compare it to everything else there. I've found this sometimes helps me finish other tasks, e.g. recently I added Project Y which I'm really excited about but Project X is in progress with maybe a days worth of work. If I finish Project X, it is off my plate and I can go gangbusters on Project Y.
With regards to planning, I wouldn't say I'm a planning person either. I have just found this minimal amount of process has really helped me focus on getting stuff done without taking away any passion/creativity. As you said everyone is different so YMMV, for me if a reader could take one thing from my journey is discipline yourself to a limited amount of concurrent projects, it has done wonders for me and I definitely see friends not moving anywhere because they have too many projects competing on their limited free time.