B'Elanna Torres was the first consistently angry, frustrated, realistic depiction of a woman I relate to. In fact, I think she's the only woman like that in the media I've been exposed to. She's not just brushed off as being annoying. She's not a minor character. She's outspoken, she's talented, she doesn't take nonsense from anyone, and people work with her. She's one of the few women in Star Trek that does not get along with everyone. Also, Torres isn't just written off as "that [...]" by the crew. Obviously there are episodes where that's the case, but she doesn't go through a major personality change when people take issue with her. She's apologetic only for when she crosses a line, not apologetic for her entire character (which does happen frequently in media). Not to mention, she's a bold and outspoken woman who became Chief Engineer. Over the nice guy. And she was Chief Engineer whilst pregnant. Lieutenant Torres is my hero.
Characters like Torres are important. Science is great, but getting down and dirty into engines, electronics, or anything involving grease is considered a masculine profession -- Torres defies that, and is still the only female Chief Engineer on screen so far. Hell, even most of the women mentioned in the OP are medical/science based. While Kathryn Janeway and Seven of Nine are great and important characters in their own right, they're considered softer spoken next to Torres; bold, yes, but not necessarily as brash or aggressive. It frustrates me that Torres is frequently under-appreciated. Yeah, Janeway "got the crew home", but remember, it was Torres that made great strides in keeping the ship together (and even attempting ridiculous feats to get them home sooner) in order to do that.