In this post at LifeDev less is more is definitely true.
The way that great men organised their time is a reminder to all of us that busyness is not always the answer. I think that part of it is about using our most productive times productively.
I know that for myself productiveness also comes in cycles beyond the daily routine. I might have a week where I am incredibly productive and then have another week where I just get the everyday stuff done.
I think one of the hardest things to recognise that after a cycle of productivity comes the routine of making the creation work. Thats hard work and requires perserverance.