So, in the end, what do we have? We have a rant about a tertiary character who, instead of pushing intercom buttons and making the "daily announcements", is presented as a gifted linguist who far more three-dimensional than the original character. However, being a tertiary character, we are unfortunately told about her accomplishments rather than have them happen on screen.
So what? It's not like Uhura is the main character. IF this were a TV series and, after an entire season, we never got to see Uhura use the skills her character is said to have, then a rant might be in order. We got to see Hoshi do it in Enterprise because they had 20+ hours per season--they could afford to give a minor character a few moments.
The important characters are Kirk and Spock, then McCoy--the rest are minor. Anyone who thought this would magically turn into an ensemble story where each character gets important screen time was bound to be disappointed (and they were foolish to think it would be like that). It's a two hour movie, with two characters clearly far more important than the rest--exactly as advertised. Of course there are movies with large casts where each character gets to shine and screen time is more evenly apportioned. They rarely (if at all) have two iconic characters that are far more well-known and loved than the rest, though.