I have a red 2D Locus locked in on my template file. I also have this symbol classes REF-Locus to turn it off when laying out sheet layers. My purposes is to teach students the importance of 0,0,0 but I have found it useful for snapping.
Yes, I know the locus will not print, but it will expand a viewport to an annoying size if you are annotating a drawing 10' in the air. 🙂