Wow, you're right! "sudo apt-get install openssh-server sshfs", configuring it, and then figuring out how to access that from every device you have is certainly easier than installing the DropBox app.
You and I (and probably a lot of people on Slashdot) know how to set up such things. Most people don't. And even those of us who do don't always enjoy reinventing the wheel. I completely get that you don't want or need to use such services, but the attitude of "why would ANYONE want such a thing" really baffles me.
And besides, I use yum, you insensitive clod!
That's why there are applications like Subsonic that allow you to easily setup your media library so you can stream it to and from anywhere: http://www.subsonic.org/pages/index.jsp