Back in my CFI days I worked with couple of fighter pilots that wanted to get checked out at our school for the 172 and 172RG. It was fun trying to getting them used to the speed or lack of and the way checklists are used in this side of flying. One guy we signed off in only a couple flights. The other guy we sent packing. I quite frankly don't know how he was still flying fighters with the attitude he had, his refusal to take any kind of instruction and had an ego that was gigantic. I guess he was one of the 10% of aholes that every place has.
One of the interesting things about military flying, and tactical flying in particular, is that the focus is on the "mission" portion of the flight. The stuff that happens in between the time we cross into bad guy territory, enter the MOA or range, and turn the MASTER ARM on. The things that we do starting at that point are what define us as tactical aviators, and that's consequently where we focus 99% of our effort and expertise.
Everything around that time of the flight -- starting, taking off, flying out to the MOA/range/battle lines, and then the reverse to go back and land after the mission -- is called "admin", or "admnistration". It's really considered the least important portion of the flight...although it's certainly important in it's own right, it never wins the war, shoots the MiG down, or bombs the evil dictator's mansion.
Unfortunately, this "admin" portion of the flight is what comprises 99% of civilian aviation. Most tactical guys don't really take pride in accomplishment of these portions of the flight; we don't sit back in the bar after the debrief and reflect on that awesome ILS down to 200 & 1/2. We don't care about touching the nosewheel down within an inch of centerline. The smoothness and efficiency of the enroute descent to the FAF is never debriefed (unless it's completely heinous). Our ability to set just the right fuel flow during cruise such that we saved time/saved fuel is not pondered.
The prestart/start/taxi/takeoff/climb/cruise/descent/before landing/after landing/engine shutdown checklists usually fall into that same category. Although it's highly important to perform these checklists correctly, it's just not feasible to have the checklist open, on your knee, and referenced for every step in order in sequence. It's significantly more logical to have the checklist memorized, and then to reference it quickly to review and ensure no items were omitted (think about performing that descent check while you're flying in formation, on the wing in the weather, preparing for an instrument approach -- you just don't have enough hands and enough eyeballs to do both).
So...what does this have to do with civil flying?
Most tactical guys (most of whom have very little interest in civil aviation anyway, but that's another story) don't internalize that they must shift gears into a different thought process when they are flying in the non-tactical world. Again, back to the point about biases and prejudices, there are many fighter dudes who think that "the way it's done in fighters" is the way it should be done everywhere, and try to apply that "this is only admin" sensibility to other types of flying. This is the thought process that leads to stories like you, and many other CFIs, have. I'm sure there are plenty of sim instructors at airlines who have similar stories about fighter guys going through initial training to fly <insert commercial aircraft here>.
I'm perfectly aware that the methodology and procedures that I use after climbing in to a F-15E are completely different than the ones I use after strapping in to the front end of a King Air, and both of those are different than the ones I'll use strapping into a Cessna 150 or 172. To me, the 'skill' is being able to adapt when learning, and then correctly apply the standards, methods, and procedures specific to that aircraft and that operating environment (so far as the 'monkey skills' go -- I bring the combined airmanship of all those different types of flying with me no matter which aircraft I'm in, AND continue to learn and adapt that airmanship based on new knowledge and experiences).
There are tons of people from my community who don't, unfortunately.