Well, in terms of which function I expressed, the world saw my Ne almost exclusively growing up and it is by far the "easiest" for me to use and show externally.... However, I do know that the extraverted function I use regularly - Fe - is VERY easy to articulate for me. In fact, I think I articulate it so clearly that it drives others up a wall.
...I'm apt to think that any extraverted function you use regularly is going to be the easiest to articulate - especially your auxillary as it is what you show to the world. As an INTP, do you feel you can easily articulate Ti or do you find Ne is easier?
Ti usually lurks inside and was not shown to many people. You have the clearest chance to see it when I am writing in a "serious mood" or I know you personally and trust you and we are having a good conversation. (Although it leaks out in my attitudes and approaches to situations too.)
So yes, I Ne a lot of the time until I start feeling frivolous, then drop back to Ti (and usually withdraw a bit).
I'm not totally getting what you are saying about the inferior driving your primary. That would mean Fe would be driving my Ti? (I think I have a good Fe now and actually like using it, but it exhausts me after awhile and I will dwindle back into flat Ti mode.)