It's not a "trip of a lifetime" (closest I did to a driving "trip of a lifetime" in Europe was driving from Lisbon to Amsterdam, about 2000km which I did in 2 days), it's just part of my mental calculation of whether something is fun or not.

City driving is not fun for me, so having to spend 1h each way just to go somewhere to have fun reduces the overall appeal of it vs spending 15m in the tube each way to go somewhere to have fun.

Back when I lived in Lisbon I used to have a 1h commute by car to work because I lived in the outskirts and had to endure traffic jams on the way in, but over the years I lost patience with spending a significant fraction of my life in city traffic and, frankly, don't have to endure it anymore.

More broadly I would say that your use of miles vs my use of time isn't a like to like comparison: the problem isn't distance if you can get there fast or at least in a relaxed way, the problem is when it takes quite a bit to get there and the driving is stressful. Driving out of the city starting from Central London would be like driving out New York from Manhattan: a lot of pain in the arse city driving in the transit just to get to the nearest freeway and then some extra pain from driving in a freeway with lots of traffic until you're far out enough that there's a lot less traffic and you can relax, and all this is if you're lucky and don't get a traffic jam.

Driving a long distance starting from suburbia can actually be fun, but driving anywhere starting from the center of a big city is not fun.