I like Si (or what I percieve to be Si in me) because..
1) It gives me the ability to remember tiny obscure details about the things I thought were important at the time. I'm good with names because I can go back and remember what a person was like a long time ago..almost like I can get a sense of their being. For example..I'll see a face that looks familiar, I'll then go back (and this can be like a face that I saw once 6 months ago) and remember the context in which I saw that face. I can then remember all the details that came with that face like the persons name, age, major, general "essence" the person displays. I can even remember the questions I had about that person when I was interacting with them...stuff like "I wonder if that scar on her lip really was a childhood injury?" or "I remember thinking that her major didn't seem to fit her personality too well, has she changed it?"
2) I can play a song in my head from beginning to end (including the beat, lyrics, everything). I remember I was quite excited when I found out I had this ability.
3) The best thing about Si is that it helps Ne pick up where it left off last time it was in use. It gives me the ability to simply remember what possibilities I was considering at the time. It would be exhausting to have to re-Ne everything every time I saw something again..but Si allows me to remember what Ne was thinking last time..so I can just go from there..
4) Si gives me the ability to re-live situations in my head. If something interesting happened to me I can "go back" and let it "happen again" in my mind. Sometimes, I do it just because it's fun...other times because I can almost give Ne a chance to re-evaluate the situation. I've realized I can also re-live feelings of enjoyment (I discovered this just recently) simply by playing a scene that happened to me over and over again. The feelings remain real even if the scene is purely in my head.
5) This might be more Ni then Si..I'm not sure..but while re-living with Si, you can change a certain detail or aspect of the situation and almost re-live an alternate reality of what could have happened. For example..if there was a person that said "hi" to me and I just said "hi" back...I can go back and re-live that situation where I actually say "hi, how's your day going?" or even stupid stuff like "Hi, gay people suck huh?". I can then play out how I perceive that whole situation would have played out if I actually had said that. It's actually quite fun thinking about all the stuff that you could have said...
*(and btw, Si is the main reason I think I'm intp). I don't use Se or Ni (at least I don't think I use Se or Ni)..and I'm introverted. So I that means I can only be intp or isfj..and there is no way Fe is close to being my preferred extroverted function, so intp it is..)
**(wouldn't a mature and well rounded xsfj be almost indistinguishable from a xntp? I find it funny that esfjs get so much flack from intps when they use the same functions and are going to end up with very similar personalities (if the above is true, obv). The people that intps hate are the very people they are destined to become..that's just hilarious to me.. )