Risa

It's funny because I have the exact opposite opinion! I feel like in TOS, Uhura just relays messages and presses buttons on her console. Maybe I'm missing something though. Maybe she's critical to the intra ship communications as the "telephone operator" but she never seems to be critical to the mission.

On the other hand, ENT spends a lot of time building up how many languages Hoshi knows, and how quickly she can pick up new ones, even alien languages. She definitely has her moments where she just struggles until the UT works. But in several episodes they rely on her to translate alien writing, and in at least one or two, she learns to speak a whole new language to communicate. She's also shown to have developed major improvements to the UT. My impression of her, even from Broken Bow when Archer recruited her, was that she's a freaking language savant, operating and developing very new experimental tech. It is sad she didn't get to fully realize her transition from timid linguist to badass crew member (and still linguist). But I always felt like she was doing something critical for the mission, whereas I felt Uhura (in TOS) wasn't.

SNW Uhura is very different in that regard, she does a lot more "mission critical" stuff and she's getting an arc that's very reminiscent of Hoshi (totally a savant, hard working, starting out timid but growing). So I love that for her!