jlyle:I respectfully disagree. Yes, teaching OW students can be mentally and physically demanding, but the diving is hardly challenging.
The diving......isn't diving at all. If you're actually conscious of the act of diving when you're engaged in courses then I would suggest that you're asleep at the helm.
....snip....
In general, the more diving you do, the better DM/instructor you are going to be.
Totally agree. I wouldn't want a DM guiding me who wasn't experienced in the conditions at hand....
R..