She also didn't get a lot of development in IM2, since she was basically being introduced for The Avengers. Since this one was intended to be her first major role in the MCU, it makes sense for her to get a fair amount of development.I watched the Cap scene and can see why it was cut. It was a good scene, but it doesn't really add a lot to the overall team vs. Loki and the Chitauri story, and would probably fit better in a Cap solo movie.
The same could be said for a lot of the Black Widow stuff.
Window isn't getting her own movie any time soon, unlike Captain America, so most of her development will be in Avengers.
I remember around the time Avengerse came out I read an article that talked about how they had a lot more stuff with Cap adjusting to the present than what we saw in the movie, but they decided to save it for the next solo movie. So it sounds to me like they are, or at least at one point were, planning on addressing Cap's adjustment to the present in The Winter Soldier.