Since this post, Google has added the button to display only drafts. It is located at the upper right corner of the edit post page.
If you use Blogger's draft feature you may notice that your drafts are not sorted to the top of all your other post. The workaround is to use labels. Even if you already use labels, just add a new label such as Drafts, and then save your post; you can now click on your new Drafts label in the Edit Posts view and see only your drafts, or whatever post you have given that label to. What is good about this is that no one will ever know, unless you don't remove the Drafts label before publishing. Only labels that are in published post appear on the labels widget.
