DC creators have had a pretty bad track record using this unfortunate dramatic crutch for no other reason than to give their story some unearned gravitas or edginess. The fact that most of them were written by men probably didn't help.
While Alan Moore's Killing Joke used the assault on Batgirl poorly, which even he admits, I think she's probably the only example of a rape being used to benefit a character thanks to the admirable efforts of Kim Yale and John Ostrander, who salvaged Moore's mess by having Babs become Oracle, arguably a far better and more interesting character than Batgirl ever was.
However, that's about it. There are no other examples that I can think of. Black Canary's rape accomplished nothing but to give her boyfriend an excuse to kill people for a few years instead of knocking them out with his boxing glove arrow. It was utterly pointless aside from temporarily depowering her so she was less capable than Ollie. Dick Grayson's rape was never even acknowledged as far as I know, and Sue Dibny's rape was so poorly handled people are still complaining about today.
It's no surprise that DC has shied away from using rape these days, given how poorly it has gone in the past and the more recent sensitivity that art seems to have adopted towards the issue. However, does that mean the use of rape should never be used in the DCU? I'm not sure. I think if a really great creator is approaching it from a place of honesty and genuinely wants to explore the ramifications of sexual assault within the DCU in a Black Label book, maybe it could be something worthwhile. However, I don't want to see it used again in the main DCU. I don't think the vast majority of comics creators have figured out how to do it well yet, even if Bendis managed to pull it off with Jessica Jones at Marvel.