That's a great point. The exact differences between the work flows:

1. Adds drag-and-drop to choose the file to upload

2. Cleaner permissions structure

3. The button is much bigger, and there's fewer options to do other things

4. Adds galleries to look at collections of PDF files

5. Exact same number (6) of mouse clicks to copy a link to a hosted pdf to clipboard

6. Removes log-in requirement (though to be fair, it's really easy to stay logged in to Google services)

It seems to me to be a much smaller difference to the UI difference with Dropbox - the automatic mirroring and context menu actions are huge.

> (though to be fair, it's really easy to stay logged in to Google services)

Not particularly easy for the three-in-four Internet users who don't have any form of Google account, though...

Yup. I would have never thought about using Google drive to share PDF publicly. Now that I know, still not sure I would. You're damn right, interface does matter.