Man oh man. To put Martin's slowness into perspective, his most famous series is the Song of Ice and Fire series, the first book being A Game of Thrones... which was published in 1996. The series is currently 4 books long. He has, so far, spent 15 years writing 4 books of a 7 book series. The 4th book, A Feast for Crows, was published in 2005. Every single year after that, he said the next book would be ready by autumn. It... didn't happen, haha. We've finally gotten a solid publishing date for this July (happy birthday to me), but according to his livejournal, he's still working on the book like, right now. So who knows if it'll actually come out on time.

And who knows what will work for you. We all write differently and at different paces. I never get anything done unless I set a goal for myself, like "must write 1000 words per day" or "must finish by this date" or "must finish by this date or risk disappointing person I've promised this to." Maybe if you're in a dry spell, starting with a very small and manageable goal will help you pick up your speed again? 500 words per day is a pretty manageable goal.

You might get a kick out of this: http://journal.neilgaiman.com/2009/05/entitlement-issues.html

Neil Gaiman basically says what I'm trying to say to you, only better, because he's Neil Gaiman. Give it a read if you haven't already, because it's both hilarious and encouraging.