This is exactly what I do - I have vague goals which I work towards with creative steps, eg 'take a couple of hours to think about what next with my open source

This is exactly what I do - I have vague goals which I work towards with creative steps, eg 'take a couple of hours to think about what next with my open source project' and let my mind wander within that. GTD deals explicitly with the creative process and how it helps by clearing your mind in an early chapter. John Cleese talks about the importance of clearing your head before being creative here: https://www.youtube.com/watch?v=Qby0ed4aVpo&t=15m24s https://www.youtube.com/watch?v=Qby0ed4aVpo&t=15m24s