Peter, your driving philosophy and length of experience pretty much mirrors mine. I remember my early days of motoring when I used to go for a drive just because I wanted to. My youngest son does the same thing, something my wife just does not get.
I am from Birmingham originally, lived in Somerset for the last 25 years where I can drive 10 or 12 miles across the levels in no time at all, trips back to Brum are not enjoyable, wonder how I used to manage to drive in these conditions day in day out to work. With a good run I can get up to outskirts of Brum not that much different in time to the last leg down the A45 sometimes.
We do have the M5 down here of course which I try to stay well clear of in the summer, a weekend car park, however I have many memories of trips to the west country in the 60s and it could be pretty awful then down the A38.
When I see the narrow high street through Highbridge I can't believe that all that traffic went through there every summer.
So in answer to you original question Peter, I do not enjoy driving like a used to but is that entirely due to traffic conditions or, as many things, the way we see life in our teens compared to older age.
I very often wish I had the outlook of my teen years, without all the things that annoy and irritate me know.
However at 80 years and a couple of weeks old driving a couple of hundred miles does not phase me although I hate driving on these dark winter nights especially if it is wet.
Bill D.