In response to the "Does S/N really make that much of a difference?" question:
Yes. Yes, it does.
I have a teacher who is an ISTJ. Briefly, the situation is this. She has a bajillion deadlines that she has to meet. I'm willing to work and am relatively experienced editing, as I did editing work for my middle school newspaper (and wrote most of the stuff that went in the newspaper and literary magazine, but that's another story). I'm not familiar with all of the journalistic practices she uses, or the programs she works with, but I'm willing to learn them or figure them out somehow. Also, her inferior Ne wants her to make things new and exciting, which is good because we'd be moving forward. However, as her inferior function, it's not strong enough to operate on its own. My Ne is nearly as strong as my Ti, which is my dominant. It's a left hand to me. In other words, I could try my hand at helping her revamp things and put a fresh spin on them without much effort.
However, that's not what she sees. Here are her functions, in case you're not totally familiar with them.
(Left-brain alternatives Fe and Ni, and right brain alternatives Ti and Se, if you're familiar with Lenore Thomson.)
So she looks at me and sees an overambitious kid, one who skipped eighth grade and is in high school at thirteen years old. Probably cocky, too, maybe thinks she knows everything. Most of her students are sixteen to eighteen years old... not thirteen. Probably immature, then. Hmm. Does this teacher want to spend her time teaching me? About as much as she wants to walk in molten lava. (Molten lava. What a repetitive phrase...)
Even when she tells me to come up with a headline including my name, a verb and a subject, all of which need to fit into 29-31 points and I come up with "(my name here) Invents New Lifesaving Socks," and she starts cracking up because it's so absurd... even if her Ne finds appeal in that, her Si is still screaming, "No! Noooo!!! She's a waste of time! Don't let her fool you with flashy hat tricks! She knows nothing!" Which does nothing for my situation.
Just for reference... my posts are much more colloquial-ish than I would ever, ever, ever write in a newspaper.
In other words... the S/N conflict exists.