Eh? Having ever had debt, no, but debt to credit ratio absolutely affects your score, especially in the case of significant consumer debt. I can't speak to the private student loan market on this, but in the current mortgage arena it can crush you, so I would be surprised if the unsecured private student loan market was better. What's your rationale?
But yeah, OP everyone's right when it comes to the fact that the vast majority of admissions offices don't care, but many people have to get at a credit based grad plus loan to cover expenses above the federal caps.
ETA: Student loan debt doesn't seem to affect your score much, but it does factor into the lifetime caps on federal student loans. (~$224k right now if I'm not mistaken?)