I love dialogue of pretty much all sorts!
I also love, um, torturing characters.
Don't judge me (you're all writers you cannot judge me because I KNOW y'all know this feel!!
) But yeah, when shit gets real and especially when it gets real painful either emotionally or physically or both; I usually love it. There are a few exceptions to that rule, but generally that's how it is.
More vaguely speaking, I love love love when I get to certain scenes that I've been itching to do since I first started the story (or in some cases before.) Sometimes I indulge myself and write out of order, but sometimes I make myself wait on scenes. I'm sure this has been said in here already, but yeah that's a good writing feel, for sure.
Also, even though they can be bittersweet at times, I love writing endings. There's just a feeling I get. Even on the occasion I allow myself to write the end scenes before the story actually finishes proper, I still get this feeling that's just like "the ending feeling"; I don't know how to describe it, but I love it, it's special.
Also, this isn't writing exactly, but part of the process, but I love when I'm planning out a story and everything just clicks. Like, if I'm stuck on how to end it, or how the middle part will go, and then I just like get that epiphany and I know how it needs to go and (sometimes only roughly) how to get there. Also, on a related note, I LOVE it on the rare occasion that I notice a parallel or some symbolism that I really didn't intend or plan from the start, but then I'm like "ooh I'm an accidental genius and I AM SO gonna go with this!!"
(sorry this got long.
I love writing so much, and I felt like rambling about it.)