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i didn't know that i have only the track buttons to skip between my 5000 songs
Well, you have track and disc buttons, and perhaps a bit more depending on the CD changer interface on your audi head-unit.
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without sorting by artist/album, it's of no use to me.
It would probably sort by artist or album just fine. Each disc is either an artist or an album, I think. Probably an artist, that would make the most sense.
It's possible there's more to it than that, so do some research into the phatbox product and see if you can read an example of how it works.