Paul Nicholls has released an addon for the new Atto text editor that streamlines the image upload and insert process for Moodle making it much more like using Gmail or leading edge web-based text editors. According to the addon description:
This plugin automatically uploads images dropped into Atto (from your computer) as though you’d stepped through the process of inserting an image, choosing to upload a new file.
Note that this only works in browsers which support dropping files into the page – IE10+, Firefox, Chrome, Safari and Opera. Other (or older) browsers will typically open the dropped file instead.
Sounds like a great improvement in usability for any Moodle site that’s using Atto. Download and install the plugin for Atto and Moodle 2.7 from https://moodle.org/plugins/view.php?plugin=atto_imagedragdrop
See it below in a quick GIF