I agree with Lauren Ashley that Ni is also quite interested in the 'Why' and really wanting to understand, on a deep level, the workings and motivations of others and why they feel, act, or think the way they do. For myself, the NiFe probably results in my always finding people 'Interesting'. Not immediately judging, but just being rather fascinated, and even understanding, other peoples' perceptions and way of approaching the world, even if I don't myself hold the views or approach in that way. I think a phrase I often use is...'Huh, that's interesting' - or some form of that phrase.
But, I also kinda relate to Amargith's description of Fe being more driven to a workable solution. It's my push towards closure. I have noticed in myself that while I might for a long while listen to someone, and empathize, etc, I eventually hit a point where I don't want to hear the problem anymore, I want the person to either work on a 'solution' and demonstrate some sort of change or action on their part to solve their problem besides just sitting in their emotions, or I don't want to hear them talk about it anymore. To be clear, this would involve a period of time; weeks or months (and I'm aware the nature of some problems takes years to resolve, and I'm understanding of that). After a period of time, and very much depending on the situation and the person, I will grow impatient and I won't be able to be purely empathetic anymore - I will want the person to move forward. I get tired of just being the listener. I don't know that this is exclusive to Fe, however. I do agree though that Fe is more closure-oriented, in general.
I also understand the 'stoic' concept, and that matches how a couple of my NFJ friends come across.
And I don't personally relate to the social etiquette concept. I mean, I believe in being respectful and tactful, but I'm definitely not a dominant Fe and don't relate to many of the more tangible, Fe-dom aspects of Fe - hostessing, making sure everyone in a group is being attended to, etc.
Edit: I also think there are many dimensions of Fe. Your more tangible, social-etiquette/cultural 'rules' one tends to be what most people associate with Fe, and it is why Fe can get such a bad rep. There's also the dimension of 1:1 interaction with another and how that dynamic works - communication style, *active* listening (something I don't think NFP's do quite so well), questioning, and really attuning yourself to the other person and putting your own beliefs/reactions on the back burner as they don't really apply to how the other person might operate; adjusting communication style as necessary. And, there are other aspects of Fe I'm sure, but those are the two at the forefront of my mind right now.