Road signs now frequently route you via main trunk roads rather than the most direct route, so even if you know that Banbury is on the way from Oxford to Stratford, you get sent in a completely different direction if you follow signs to Stratford from Oxford.
They keep changing the road numbers too, in an effort to 'smooth traffic flow'.
And worst of all, if you *do* have a map, there's nowhere convenient to stop and check it on all but the quietest routes.
So what worked 20 or 30 years ago simply doesn't work today. Too much traffic, nowhere to stop, strategic traffic management.
I can get within a couple of miles of most places in the UK without satnav or a map, but that last couple of miles can be a nightmare in an unfamiliar town, in the rain, in the dark, after a day of travelling.
A couple of us went to Le Mans last year. Both seasoned travellers in our fifties, we didn't need a map to get from home in Suffolk to Le Mans. We'd booked into a hotel we'd stayed at several times before, but we couldn't find it because they've built a tram system and a couple of key routes were either closed or were one way streets going the wrong way. After 30 minutes of chasing our tails round the city, we got Google maps up on a phone and were there in three minutes.