I think that soon I will be abandoning our use of gallery2. A few years ago we started using gallery2 to share our photos with friends and family. gallery2 allowed us to upload the photos and let our friends comment on them. When I set this up, there weren't many other photo sharing sites.
Now, we upload all of our photos to flickr for backup purposes. And we select some of those photos to share with friends and family. In addition we have started to use facebook to share photos. The one good thing about using flickr and Facebook is that it is easy to set up permissions to allow only the people that you want to see your photos. The one downside is that there is another company that I would have do deal with for the photos.
I will probably not be uploading anything to our gallery2 installation, but leave what is there now there. We will probably just be posting things to flickr or Facebook.