OS X Mavericks - Have to pull mouse down on full-screen app to see dock
This seems to be the new gesture in Mavericks.  It used to be that you had to pull the mouse/trackpad down twice in quick succession.  Now you just have to hold the mouse/trackpad down at the bottom of the screen.  I had not figured this one out before reading your post, so thank you.  I have found nothing about this anywhere else. Apparently, this gesture cannot be changed.