I was aware that the power supply kind of acts like a surge protector, in the sense that it'll distribute power to whatever needs it-- assuming it can supply it.
However, I have found that I have to group things separately. For example, the way my case is, I can't have my graphics card + my DVD rom on the same line because it won't reach.
I just kind of grouped everything together in its own little bunches just to stay organized. Meaning, for each "section" of connectors that came from the power supply, I tried to even them out to what they power.
I doubt you're hurting anything. If that was anything to watch out for, I'm sure I would of read about it on these forums at some point. The biggest gripe with power supplies is making sure that you get one that can supply enough power, and 580 watts is pretty beefy so I doubt you have much to worry about.
Granted, I'm not positive. Just stating personal opinion/experience.