Longwinded folk who don't seem able to say anything in under 800 pages:

* StephenWolfram
** All the more impressive when you consider he never includes a proper bibliography... 
* KenWilber
* DonBox
* NealStephenson
* MartinFowler (not really, UmlDistilled is around 170pp)
* MarcelProust, for Remembrance of Things Past
* StevenKing