I'd posted about that video in my blog back in May- because it really does seem like such a clear example. (I wish there were such Fe/Fi or Ne/Ni examples out there.)
It's like Ni or Si both have some much bigger task mapped out (the immediate significance can be invisible to Pe)- the 'end' goes way beyond the jump over "photocopier" and it seems like that jump should be easy and fast to Te (I presume). Yet Ti is narrowed in on the expanse of that immediate task (e.g. define photocopier) that's directly being experienced- a fragment of the whole task is taken as a sort of entire task within itself (the immediate significance can be invisible to Je)- and it seems like answering a fragment of that whole incorrectly will ultimately lead down such an incorrect path that it will render the whole endeavor pointless.
It's kind of like- when Jedomaux (our Je dom/aux protagonist) is driving, s/he doesn't want to make any pit stops until AFTER, until the drive home. [I think this is because with introverted perception, Jedomaux can take for granted that if it's important enough, then s/he
will remember (and if s/he forgets every single time, then it probably isn't important)- but
can't take for granted that if that 'bigger task' doesn't get completed then s/he will quickly figure something else out (because Jedomaux can't interact mercurially with external environment).] But when Pedomaux is driving, s/he wants to make ALL THE pit stops- it seems pointless to stop afterward instead. [I think this is because Pedomaux can take for granted that it's okay if the original reason everyone piled in the car changes with every single pit stop and s/he never makes it to that destination (or even anything close), because s/he can act so mercurially with the external environment that s/he can always quickly figure something out in a pinch- but Pedomaux
can't take for granted s/he will remember that pit stop 'on the way home instead' (that s/he will remember the problem and revisit it in their head if/when the almost completed 'bigger task' needs tweaking) because the Pe purview is limited to the immediate moment (just as Je limits Jedomaux's ability to be mercurial within the immediate moment).
I don't remember which philosopher* it was that came up with that paradox about how you can never really 'get' someplace because first you must go halfway- and then between halfway and the end, you must go halfway again- and so on, and so on. It seems to make Pedomaux anxious when they can't establish "right here is halfway"- as if going further is pointless if that can't constantly be established- but the more it happens, the more Jedomaux is all "IF YOU KEEP DOING THAT, WE'LL NEVER GET
ANYWHERE." It causes something like pure existential chaos for Jedomaux, and it can be very distressing (just as I presume it causes some equivalent distress in Pedomaux to
not be able to do that).
eta: so yeah,
*Zeno. It was Zeno's paradox. Thanks Seymour.
For one thing, I think it's interesting that you connect the immediacy of Pe to a difficulty with revisiting ideas, and general forgetfulness. This certainly works for me as a great explanation as to why Ps are so forgetful in comparison to Js. 
Ha. Sorry. That whole thing had been brewing in my head, and this video has been helpful to me this year in clarifying the external appearance of Pi/Pe/Ji/Je. So.... saw the video surface -> spewed the tangents I'd been cooking. 
