Well Peter,
I work on the basis of how do I feel, feel good no recent problems, so why would I croak it on holiday ??. I go without travel insurance ( car and van insured ) but not me. I carry the European Health Insurance Card, and work on the basis of if I fell over they would pick me up,patch me up, and send me home. If it was ok to travel I would get one of our sons to come and get us, drive us back and take the ferry. If not we would use the van as a holiday home until I could travel. I know this is a very personal thing, and it takes a good amount thinking about before making a decsion. I was in the states and I had a vein start to leak in my brain, it was deemed to be life threating so I needed urgent treatment, cost was $270.000 so I would not advise going to the US without insurance, but Europe and being good Europeans why not. I believe treatment in France or Spain is as good as it is in your local hospital,so why worry. Acute in Europe is fine, chronic is a different thing altogether. I think it boils down to what you are comfortable with i.e where are you going, and for how long, what condition do you feel you are in. And has your GP given you the ok to travel.
Val & Frank