Yes, longhand is my (not so) secret writer's block trick, too! For me, it more focuses my mind: there I am with my notebook, no internet, no ability to edit, and no distractions but what I can see out the window. And so my choices are to look out the window or work out what happens next in the story -- and shocker of shockers, I often work out what comes next while looking out the window!

Also, I just like my handwriting. I enjoy the physical sensation of laying the words down and looking at them, when I'm writing longhand. :-D