Well, I'm back, head still un-bashed
What you're describing is rotation. You're giving yourself a rotation as you launch, by jumping off your edges a certain way. OK, I'm gonna try this one more time, then simply accept that I can't describe it adequately.
First, think of doing a straight air. No spin, no 180, no nohing.
Now, think of doing a straight air, but instead of your shoulders being parallel to the board, as you approach the jump you had turned your upper body so that you're facing forward on your board, and your shoulders are perpendicular to the board. But still don't do anything as you launch. It's still a straight air, just with bad form.
Now, do all that, but after
you launch, rotate your upper body clockwise (if you're regular) and your lower body/board counterclockwise. If you had enough prewind, and if you're not too bottom-heavy, you'll be able to bring your board all the way around to switch without having any initial rotation.
I was beginning to doubt my own sanity after this thread, so I went back and re-watched the 180's vid, and yeah, it's saying what I remember it saying. I think the problem must be that I'm explaining it badly and creating a different image from what I'm trying to.
Also, even in a counter-rotated 180, I think there must be some initial rotation, otherwise you'd end up facing backside. The counter's probably mostly "tuning" the jump so that you land having done 180 rather than, say, 210 (which we all know is bad).