I use more here than I use on INTPc. They're "short-hand" for me to add a sense of nuance to the words, so people can understand what I'm saying -- like adding "body language" to a virtual text. If I use too many, it starts feeling like being "overly gushy" and I actually become uncomfortable doing it... like adding a whole string of XOXOXOXO's to a letter. Just... too much.
I don't need to do it on INTPc because people there are more concerned about the content and don't care about the person's intentions as much, they ignore body language in real life and don't emote much themselves. Here, though, the people are much more keyed into that sort of thing.
FPs seem to use them an awful lot to just... emote. (?)