I think that the main use comes from when you're not at your own computer. If you're at work or a friend's house, it'll be far simpler to just drag the file into the browser than to install dropbox.
I'm in that situation about four times a year and this will be a huge time saver compared to the old system.
I'm in that situation about four times a year and this will be a huge time saver compared to the old system.