I like SIMPLE storyboards. Over elaborated storyboards, with arrows, direction lines and camera instructions look like bullshit to me. I always draw very simple frames and shoot them with the right timing and minimal camera moves. Very often I use these drawings, enlarged, as rough layouts and colour keys. I believe in simplicity and spontaneity in the very "unspontaneous" art of animation. These are the opening scenes for a short I made for Paul McCartney in 1998. "The Light Comes From Within".
I almost always used my animation thumbnail storyboard drawings as layouts or sometimes as final artwork. Here is an example from my film "Shadows Cycle". Alas I didn't use this image in the final film since I changed my mind about the script.