Hi Clanddestino,
Instrument rated pilots tend to fly according to instruments, not according to their senses.
I disagree. Do you believe that pilots ignore any sense of delta g? Why don't Boeing pilot's pull their wings off?
Some crew's response to a TCAS RA in the simulator (where there is no change in sensed delta g) can be "over enthusiastic". In normal line flying, pilot pitch rate of change is adjusted according to sensed g.
When faced with an abundance of visual and audio information, the overloaded brain will only process selected bits at any one time. The sensed vertical acceleration would direct attention to pitch. It's part of the human behaviour feed back loop.
edit.
Definition of "properly trained IR pilot" includes, but is not limited to: proper initial IR training, proper type rating training and proper recurrent training.
The last two are now done in a simulator which maintains its physical heading, and can only simulate long term horizontal accelerations or very short term vertical (e.g. light turbulence). There is
no spatial disorientation in a simulator. What makes you think it is now properly trained?