I made a Mac app for printing templates for thumbnail layouts of comic pages. It's called Comic Thumbs and it is available on the Mac App Store.
You tell Comic Thumbs how many pages will be in your comic, manga, or graphic novel. Then tell it the dimensions of your art board. The app will draw the template for you, with the pages paired up and numbered. You can customize the size of the thumbnail frames to fit more of them on a sheet of paper, or enlarge them so you can add more detail. You can add text to the header and/or footer, such as the name and issue number of your comic, your contact information, copyright, or whatever you need to communicate when sending these thumbnails to your team. Then print and draw. All of these settings are remembered the next time you launch the app.
I hope you like it and I hope it saves you some time.