Spot on about how the highs and lows grab you when you first enter a "high end" showroom. It's akin to what you see when evaluating TVs: settings that look great but permanently burn out the rods and cones in the back of your eye if you look long enough.
On another thread I stated just how much I'm now enjoying my CDP just by swapping out some ICs. Enough to stop listening to my iMac. All the little things you allude to besides the highs and lows that grab your attention come into play now. Gone is the indistinct, the vague, the missing, replaced by all the pertinent cues that make it seem all the more realistic. My speaker 'seems' to go lower though I know it doesn't. It just now has all the cues necessary to complete the picture of an upright bass, realistically.
Ambient cues like hands gently tapping and strumming along on instruments,
musicians preparing to play as they adjust their hands on their instruments, entering lightly before playing forcefully. There are times now where I swear I can almost discern body language or position as they play.
Spooky times indeed.
I've gotten to where, due to my listening room, I prefer these type of cues and sounds to whether or not I have that giant recreation of an orchestra's venue. Even from an orchestra, one can catch these kinds of cues, making it more convincing, for me. The rest I can fill out in my mind, overlooking the obvious.
All the best,
Nonoise