Google Music and Google Picasa. Done. Android doesn't need a computer to sync anything up. Contact export out to Gmail and it will just sync. Use dropbox to automatically upload pictures or use drop sync like I do to manage the files on both the internal memory and external memory.
It is different than apple yes, no software is required on the computer, I have yet to use Kies or anything else they just goof things up, including itunes.
It is almost 2013 needing to plug your phone in for anything other than maybe flashing is old fashioned.
Enjoy the sg3 and give Google Music and Picasa a shot.
Here is what I use to manage my Web albums.
https://play.google.com/store/apps/details?id=com.imprologic.micasa
None of this stuff needs to be stored on the device, I think that is where your frustration is coming from. Kies is not a good piece of software but it is not needed either. The power comes with Google, and also with double twist if you are insistent on syncing locally, even thought android is really made for online from anywhere, it has space for it but should be used for apps and locally cached stuff not the 5000 songs you want, stream it