I normally move back and forth to the opposite side for making turns into roads or when playing at speed. IMO, it gives you better visability through the turn and well as less of a lean angle (not such a tight turn), or in otherwords a better line. People all have their own reasons for where they ride. The only one I do avoid is just riding in the middle of the lane. Kathy again has already explained this, and I think that way also. I guess I agree with Kathy a lot in the thread!
I was taught that when approaching corners to move to the opposite side of the lane. So when taking a left I move right and when taking a right curve I will move left, although not as important because of the potential of leaning over the line on a left curve and being too far left.
My instructors also warned us that the middle of the lane can potentially be very hazardous with spills from cagers. Here in upstate NY riding in the RH side of the lane can be a challenge because the roads are usually patched or tarred there. I do move to the right when approaching hills as well when I ride alone.
Slabbed it to MA a couple of weekends ago and did about 3 hours in the RH side of the lane with Blaise in front and to the left. Saw LOTS of bikes hugging the RH white line or sitting in the middle. I guess people learn differently from place to place.