If we're sharing our save templates, I have
Code:
Books/{author_sort[0]}/{authors}/{title} - {authors}
Which give me /Books/M/Christopher Moore/Noir - Christopher Moore.kepub.epub
This sorts the books into 26ish folders based on first initial of last name. Also, since all the M authors are in the same folder now, it's easier to find the author I want with the first name. That won't work for most of you, but it works for my brain.
Keep in mind that if you change your template, you can't easily send a replacement copy to your Kobo and have it overwrite your original. Once I settled on a new template, I made sure that all the progress bookmarks were saved to Calibre, I deleted all the books on the Kobo, and reloaded everything with the new template structure.