It's a dangerously dismissive attitude to start talking about visual disorientation, unusual attitudes, vertigo and sensory illusions all at the same time - as if they are interchangeable terms for much the same phenomenon.
Some of these Human Factors phenomena are much more attention-getting, alarming and confusing than others. The somatogravic illusion is unique inasmuch as it can and does affect both pilots simultaneously. That fact explains much of what didn't happen in the GF072 cockpit at that crucial time.
So if you experience it, don't expect that your oppo will be much help - or that you will exit it successfully. Long-term USN experience and a wealth of "unexplained" accidents bear out that morbid fact.
If you read on from this 31 Aug 2000
http://www.pprune.org/ubb/NonCGI/For...009550-15.html
Belgique post, you might observe that apparently few people had at that time heard of the
"pitch-up illusion". Hopefully that's now changed. You cannot practice it in a sim but you can ensure that it's not something you'd fail to recognise when it comes your turn.