After finishing upgrading Ubuntu from 12.10 to 13.04 today, I have noticed that I can connect the Galaxy S3 directly to my Ubuntu PC.
This is really a good thing. That is one of the things I like more about rolling releases than scheduled ones. I am sure this support for Galaxy phones was abailable on Arch Linux long before. With Ubuntu you have to wait utnil the next release, or start to tweak it yourself.
Anyway the good news, is that now it is supported, I will not need the Mac for that again.