Wow, apologies for having you reminisce on such an awful experience. To have that happen to a you at this day and age in a newish car is simply unacceptable. I mean look at our german counterparts like BMW, they've done away with temperature gauges for some time now which to me, seems to highlight a massive confidence in their cooling systems. Absolute shame really that things as simple as this hasn't been fully resolved by Alfa engineers.
The worst past was that I was transporting some of my in-laws to a lunch and had only hours earlier dismissed their enquiries of "an Alfa, don't they break down a lot?"
The second worst part was missing the lunch completely
Third worst was not getting home (30 miles away) for 6 hours due to the RAC being complete fools
First and only problem I had with the car though