Yes, very interesting the frequency of this phenomenon AND the way it annoys us drivers! My wife was an excellent and careful (but not cautious!) driver and I always loved being driven by her. I was so, so proud when she - thrilled to the core - drove us across THE Bridge in Sweden (from the famous BBC4 series). I though always did most of the big journeys and she was happy to let me take the strain. Always keen to warn of (reasonable) hazards, she has now - as she's become more ill with AD and no longer can drive - become obsessive - humps, gaps between cars that I 'should' be closing, parking hazards, distance from the kerb, speed limits - you name it, she's warned me about it or shouted at me to obey her about. The other day - instinctively - I edged out into a solid stalled line of traffic when she urgently told me to do so and found myself in precarious circs with cars bearing down. I tell myself to ignore her, but a yelled 'stop' or 'go NOW' is hard NOT to pay attention to. I've asked her to stop as it's dangerous, but to no avail. She forgets I've said it.
It's also very sapping of confidence. When I drive alone, it's like a HUGE weight taken off my shoulders. I am a confident, very experienced driver and - however much I tell myself this is just another manifestation of my darling wife's illness - incredibly sapping. Nothing to do with masculinity but simply that I love and have always loved driving, with confidence and care. It's just another little bit of collateral damage from the so-sad effects of this cursed disease. So, as they say, welcome to the club! My sympathies.