I don't know if there's any need for me to. You seem to have it down pretty well!
I agree that Aquarelle was oversimplifying quite a bit. And the bolded is pretty damn close to the metaphors that I usually use for Si/Ne. I alternate between describing it as a filing cabinet, or a puzzle. By the filing cabinet metaphor, all of the information/experience that I have is contained in that cabinet, sorted into categories for easy access -- but it's equally easy to rearrange those files as necessary, or make new folders, if new information comes up that defies the previous categorization. By the puzzle metaphor, you have millions of puzzle pieces of all different colors, but many of the shapes are the same. So, you can have a red puzzle piece in the predominantly blue area of the puzzle, and it'll feel wrong to you, on a gut level, that that piece is there. Somehow, you know what this puzzle is supposed to look like, but you might not know exactly what puzzle piece should go there instead -- or you might know exactly which piece should go there. Either way, I can't count the number of times in my everyday life when I've looked at something, had a vague sense that something is wrong about it, and then realized that it was somehow changed since I saw it last. (e.g. when a room gets new wallpaper.) I call that Si at work.
I also read an Si description online, that used an example of cooking a particular recipe for the second time. An Si-user might be able to go through that recipe and make it exactly the way they did the first time -- which could make Ni-users think that they just "have a really good memory" -- but it does not feel like that for the Si-user, in the moment. It feels like you're going by instinct, from your gut. You go "I guess I'll put this amount of salt in, because that feels right to me", and it turns out that the reason why it feels right is that that's the way you'd seen it done before. An Si-user can't imagine cooking any other way -- either you go with your gut, based on what's "right" from past experience, or you follow a recipe and set yourself a new precedent. If an Si-user watches an Ni-user cook something for a second time, it might unnerve or worry them because of how haphazard and chaotic their process is by comparison. It's not based in anything, they're just doing things that could go horribly wrong at any time.
Which leads me to how much I agree with @AffirmativeAnxiety 's post about S vs. N. His descriptions are really good. When an Si-user uses their Ne and makes a crazy association or thinks of a crazy idea, it comes from leaping from one part of the file cabinet to the other, or grabbing two random puzzle pieces from the puzzle. But it's still confined to within the puzzle, or within the filing cabinet. There are limits to our use of Ne in that regard.
Correct me if I'm wrong, [MENTION=7254]Wind-Up Rex[/MENTION], but I think there's been a miscommunication here. It's not that people look ENTJ when they're well-read, it's that people have a stereotype that if you're well-read, then you're an ENTJ. People don't associate ESFJs with book-smarts, or intellectual thinking, but they associate them with friendliness (or passive-aggression), and tradition, and practical knowledge.
I must have missed something here. Did anyone on this thread say that you were an SF because you're right-wing? Was that connection ever made explicitly?
I don't know about other people on this thread, but I swear to you, Lark, I am not judging you as a person from your political beliefs. This conversation is not as personal as you think it is.
Just to clarify -- are you saying that you think people are Feelers when they get infuriated during political discussions?
Firstly, I thought all heads in this conversation were cool already?

I'm not getting any negative vibes here.
Secondly, you say that you're not knowledgeable on some elements of the MBTI, but you're also certain enough of your type that you don't want to consider other options (besides ENTJ and INTJ). What's the harm in learning more, either from people on the forum or from books on the topic, so that you can say with a good amount of supportive data that you're ENTJ or ESFJ or whatever type you end up being?