The root cause of the UPS driver's accident was not CC it was following too close. I have been using Cruise Control in the rainy Pacific Northwest (Seattle Area) for over 30 years and have never had an issue.
Rondo: As a Firefighter I too have taken driving courses (EVOC) and when you take your next drivers course I think it would be fun to see if they would allow you to try CC on a wet skid pad to see if you could get it to cause a problem. It would be interesting to hear your findings.
I have been told that the new modern cars (and some trucks) have anti skid systems that compare the speed of front wheels and rear wheels and detect if the drive wheels are spinning more than non drive wheels and will automatically reduce engine power in order to reduce speed.
So using cruise control with a modern car you should not have any problem of sudden acceleration when aquaplaning occurs because anti skid will react and reduce speed.
Interesting read -
http://www.mynrma.com.au/blog/2014/0...d-aquaplaning/