On the contrary, you will probably use it all the time. I remember first creating a Gravatar account for .SE - I’m always pleased when I sign up for a new site and my avatar just shows up.
- you can change multiple avatars from a single place
- you no longer need to manually set/change them on individual sites (using Gravatar)
- you can easily hotlink your own avatar
But again, as Sam said, support for hosted avatars is on the roadmap.