My wife uses Dropbox on her Mac that same exact way. Easy to import into iPhoto because the Mac app binds Dropbox to the Finder, iPhoto sees it as just another folder.
Do they still offer the free 50 GB storage for the SGS4?
Dropbox to be included on all Samsung flagship phones and camera - Computerworld
If so, forget what I said, I agree on Dropbox for photos and videos.
OP, activate Dropbox on your phone, then on your Mac visit dropbox.com, sign in, and then go to https://www.dropbox.com/gs
Follow the simple steps to claim your free storage.