I'm always doing new for the sake of new. That includes ideas, theories, etc. Once something becomes static to me, I'm moving onto something else. It will happen with Jungian theory also, as it has with any other ideas I've gotten hung up on for a time.....the less complex they are, the faster I move on too.
When I repeat something or stick with it long-term, I feel the need to change at least some details or see some other angle on it. If I don't, I feel trapped. It is very much about ideas though. The idea of something new motivates me more than a need for experience, if that makes sense. This is why I often enjoy the idea of newness more than the new experience itself. My Si comfort indulgence comes when I am stressed because of that; then, I'm spread too thin to risk the new.
So I definitely have some signature stuff I do, but even within that I vary the nuances. I mean, when I worked in an office, I'd take a coffee break nearly every afternoon, but I'd vary the shops I'd go to, the walking route I'd take to get there, the kind of coffee I ordered, etc. That's about as close as I got to routine, and I'd also attribute that to a caffeine addiction . I tend to do what my mood dictates, which throws a wrench into routine & planning.
The one area I like little change in is PEOPLE. I like the same, old people I am comfortable with, but discussing new ideas & experiencing new things with them. I do like to meet new people, but it gives me some anxiety, and I prefer 1-2 new people at a time in an otherwise familiar group. I think this is more related to shyness than MBTI type though.
EDIT: I will also say that I don't consider a preference for novelty in certain areas an indicator of Se/Ni or Ne/Si so much as he WAY person prefers to process that info, the REASON they pursue it, etc. It's the thinking behind the action that indicates the preferred cognitive process, IMO.