Bartholomew...good arguments!! Sorry its been so long, I have been busy. Anyway, first and foremost, i have to state that "to each there own"...i mean whatever makes you most effective on the field is what you need to be doing/using IMO. I really can't describe/explain the feeling, but here is a non-related type example. When I'm driving..even if its 100 degrees out, i still feel the need for the windows to be down...I have to "be in touch" with outside...its weird, but I have to hear and "feel" the road and my surroundings....When i use optics, its kind of the same as the windows being closed for me. I know...weird analogy and its not like a paranoid/clausterphobic/tunnel vision type thing.
Anyway, to directly answer some of your questions.
My world: Combat experienced Marine
I have used ALL of the optics u mentioned, and i should say that there DEFINETLY are places/times where i would use/need them...like low light, etc. But my initial rant was using them as PRIMARY (where did my irons go???) sources..
Gut feeling...i have NOT timed myself...u make a good point b/c gut feeling isnt always right (although i think it is FOR ME in this case)
and finally, any optic that will allow you to retain the irons, or allow for a back up sight configuration is ABSOLUTELY the way to go...any edge (technology, etc) one can have over the enemy is one that needs to be taken advantage of...i agree completly. SO in that sense.... all the optics you mentioned should be run on the rifles if possible.
My concern I guess is just watching people getting too "friendly" with them.