I ALWAYS use the kill switch, on every bike that has one.  For me it's safer to get the engine off than to accidently pop the clutch or something such.  Always seems easier to think with the engine off than running.

AND I have left the lights on and the key in it (on all 3 bikes I've owned) and gone dead a few times.  So I got in the habit of locking the forks when I left the bike (at least when I wasn't putting it in the garage) so I would at least have to pull the key out to lock it.  That helps me not forget the key and walking around the front of the bike gives me a chance to notice the light.

It's all about developing personal habits that work for you and your bike.  Pilots develop a check list for EVERYTHING!  Why? So the stuff that needs to get done does get done and in the right order.

If you want to disable the European/Asian? parking light bit I think there is a post in the tech section on which wire to cut off the ignition switch. At least then if you roll the key the wrong way and pull it, the light won't kill the battery while your gone. Wonder how the European riders get theirs started when they have left the light on for hours? I had a Mercedes while there with the German light setup and you could turn the park lights on on the street side only when you parked over the curb and on the sidewalk on the narrow streets. Max