Years ago, I had intense debates with my mother about the Monica Lewinsky case. I made essentially the same point you're making here: that focusing on the power imbalance stripped Lewinsky of her agency as an adult woman. My mother's arguments that Bill Clinton had too much relative power (and was too much older) for the relationship to be reasonable didn't really sink in for me at the time.
As I've learned more about feminism in recent years, I've found myself thinking about Clinton and Lewinsky again, and I'm much more on her side now. (I still don't entirely buy the age-based concern that she raised.) Even if the relationship was entirely consensual and entirely initiated by Lewinsky and they were both happy about it, that still doesn't mean that it was healthy for the morale of their workplace, for all the reasons I listed before (quite apart from Kenneth Starr). I don't put primary blame on Lewinsky for that (though as an adult she ought to have known better): as the "boss" in the situation, it was Clinton's responsibility to turn her down, at least until he was out of office or she no longer worked for the federal government.
As for the flirty student seducing the professor, it takes two to tango. Speaking as a professor who's been pretty clearly flirted with at least once, I can tell you that I had no trouble at all indicating my lack of interest. I'm not condemning her for "setting back gender equality", but it was blindingly clear to me as the person on top of the power imbalance that anything other than a professional relationship would absolutely call my objectivity in the class into question. (In that particular case it didn't help that our broader conversation that day was about her concerns about her grade, but I would have had the same issues even if she'd had a solid A.) If a pairing like that were truly meant to be, the student would be welcome to come back and make a proposition after commencement. In the meantime, I can assure you that having my undergrads be "off limits" romantically doesn't feel like an undue burden on my love life. (Admittedly, I've been married the whole time I've been a professor. But the point still stands.)
Re: your last paragraph, about my 2nd paragraph: The original article that this whole thread is responding to is literally a collection of quotes and stories from women who found this sort of environment miserable and want it to change. If that's not enough for you, I don't think me Googling to find you more examples is likely to change your mind.