Certainly true. IMHO, innovation is about orientation, while perspiration is about walking. They live in different timescales: GTD takes time while innovation is a spark. However, both are equally important: it would be useless to go forward in a wrong direction, it would be useless to identify a meaningful direction without going forward, and it would be of course useless to walk backward.
An acceptable - and subjective ! - balance is hard to find, these days.