Hephaest,
To answer your questions:
By a light read, I meant you prefer books with a certain amount of pace. OK, LOTR is not exactly a rattle-through read, but Terry Brooks, Anne McCaffrey and several of the others that you mentioned all clip along at a steady pace. McCaffrey was one of my favourites for many years, and I still return to her work now. I've not read GRR Martin, so I cannot comment on whether he would class as a 'heavy' read. For me, a heavy read is one where, as you say of Martin's Game of Thrones, there is lots of description and not much happening. I recently spent several months trying to plow through Jordan's tenth epic in the Wheel of Time series. At the end of it I was forced to ask 'Why did I bother?' My conclusion was that I'd come too far to give up, but I found the book to be turgid and lifeless. You will not find this in any of the books I have recommended. Indeed, much the opposite.