I and E shows us how much we like being with a lot of people, that goes without saying. however, i think there's more to that, or at least this like/dislike of being with a lot of people has secondary effects. look at the MBTI types, and the types with only I vs E differences could have big emotional differences.
the one that sticks out to me is INTJ vs ENTJ. ENTJ's often have anger issues. i'm not making this up, go read up on the literature. having traveled with one before, i can safely say that guy ranks up there amongst one of the angriest people i know. he'll calm it down after his explosion, but o what an explosion. the INTJ on the other hand seems to rarely get angry. heck there's a thread about INTJ's and anger and most of them say they've never been angry at all.
INFP vs ENFP is one that i'm more familiar with and i can definitely see emotional differences. INFP's are attracted to sad things. they call tragedies and such 'beautiful'. ENFP's stay away from it like the plague. i can respect it, but i can't say i want to see something sad for the sake of it. we both dwell on the sadness being NF's, but somehow, the I likes it (as long as it's not something that's happened to themselves or whatever) whereas the other one can't stand it. why is that?
go ahead and list some of your own observations and theories. how does I vs E affect emotions?