Folders would be a nice feature for this. Although hiding tracks isn't a bad idea either. I assume that hidden tracks would also be hidden from output (like hiding columns on a spreadsheet).
Eh? If i move tracks then I could very well be destroying some very important relationship between them>? Don't you see that? I could have Text that is now obscured by c=video; Child<>Parent relationships being torn asunder and don't get me started in Compositing layers!