I've changed my views over the years.
I used to drive fast, deliberately so, in cheap sports/faster cars pushing myself and the car a bit to learn and enjoy. To qualify that, I used to often do this with a friend with his car also, and we used to get up very early on weekend mornings and go out into the country roads to roads we knew fairly well. I guess we tried to be sensible about it, oxymoron as that may be. We always slowed right up past houses and conurbations etc, and tried to keep it to quiet roads(they were much quieter then).
I took this further by taking up motor racing, and built and raced a small saloon for a year and a half before the cost got too much for me.
The interesting thing was, as soon as I got on the track with the others(experienced), I realised that you can never... ever... really drive fast on the public road, no matter how good you think you are, and you will never be a fast driver unless you learn on a track. Once you've raced on a track, you then realise that trying to go fast on the public road is highly dangerous, deeply irresponsible, and a dead end idea.
It changed my outlook completely. Over a couple of years after that, driving to me on the public road became a pure exercise of getting from A to B, safely and effectively.
Therefore, these days I tend to stick to 70-ish most of the time. If the motorway is quiet, I may trundle up to 80.
The only occasion I will go faster is often specific, and usually when I am entering a known stretch or motorway from a junction, and it's clear and quiet, and I'll nail the accelerator and just enjoy the acceleration (It's a TT so not slow) up to say 100mph, then will back off back to 70-ish.
If I want to relive the old days, I pay my money and book a track test day.