Talked to my friend and she says you and PP are wrong and she don't know why you are trying to down play it (Disney plant maybe??) I don't know you so I am going to have to stick with her account.
FYI, my family and I were on this same cruise. I can assure you that it was no where near as bad as what your friend suggest. We were not adrift for "hours", and no, there was no where near 50% of the people sick.
We had power restored within about 10 mins, and propulsion back in less than two hours. The first day at sea was rough, made worse by a stabilizer issue (which caused the power outage to begin with, btw), but all was smooth sailing on Monday (second sea day).
On Wednesday, there apparently was a minor outbreak of an illness (a certain number of people were sick) and Disney did implement measures to combat it, but to suggest 50%? Ludicrous.
In all, it was a great trip.


