There are other failures resulting in loss of attitude information such as failure of the pilot flying primary display unit and maybe some vierd electrical failures.
If that happens on take-off near V1 speed on a limited runway it might be wise to continue takeoff. Most probably that situation will not be covered by your departure briefing as reason tor the mandatory reject like engine failure, fire etc.
Aircraft is perfectly flyable and it can safely lift off.
Then the only available source if attitude information for the pilot flying would be the ADI. Just rotate into PREVIOSLY KNOWN SAFE attitude, monitor airspeed and when you feel safe and nicely climbing away transfer controls to the other pilot.
This is not just airmanship - this is a training issue.
In my humble oppinion it should be the SOP to mention this safe pitch attitude in takeoff and in go-around briefings.
This would greatly reduce the startling effect in the minds of both pilots so hopefully one of them will start monitoring the pitch angle early in the event.
alf5071h made some exellent points in his post on negative effects of startle. We are just humans.
Aplogize for the long post.