To get into Windows Explorer view
1) click on a spot on the page that allows you to bring up the top ribbon where you can select the 'Library' tab
2) under the 'Library' tab, click on the icon to 'Open with Explorer' (only works with Internet Explorer web browser)
3) a new Windows Explorer will open that allows you to copy/paste folders and files, just like you do with Windows file system
Note: Internet Explorer 64-bit will not work.
More instructions are on this page - the same instructions for uploading will also work for downloading folders/files.