I have something slightly similar but I don't think it's the same thing really. I'm hyper focussed on detail, but cannot hold an image of the whole in my head. But this never stopped me from being able to drive, in fact almost the opposite (depending on the definition of good driving/riding). I used to motorcycle in central London in the same fashion as despatch riders (do they still exist or are they all little moped riders now?) - basically riding the centre line of the road as fast as possible, slaloming between cars and keep left bollards and other road obstructions, and the bikes doing the same in the opposite direction. But left me unable to cogitate in any meaningful way. I sometimes could not even tell what route I'd taken, no memory of what happened on the journey.
Staying alive and uninjured while riding the limits took immense concentration 100% of the time, being aware of everything happening, and I was very good at picking all the element's in my range of vision (in all directions) that I needed to mentally track to make sure I never got squished. I could be concentrating so much I'd find I'm lost (I can't remember what places look like very well) have to stop occasionally so I could try and find where I was (long before sat-nav). But never able to think on it or understand what I was seeing beyond being just obstacles to be assessed and predicted and judged.
The intensity was a drug in itself, very powerful and would leave me at the end like I was coming down off a trip (metaphorically, and I suppose actually too!). Highly compelling and worth the risk for the effects while I was able to do it (my reflexes are far too sloppy these days).
Even now when out walking among people I'm always doing similar but with much less intensity being somewhat slower and less dangerous. Checking what's far ahead, who's behind me, where people are walking, what's happening corner of my eye, etc. Maintaining a situational awareness to feel more secure and in control of myself. Picking up tiny details all the time. I think it's partly why I'm good with computers and data structures, pick out the patterns and faults in data, 'visualise' the logical connections and suchlike. But I find a huge problem seeing the 'big picture' in those patterns and programs, mostly where the human interactions come into it.
But I don't think this is simultanagnosia, I can flick between the objects very fast and retain the logic of their connection even though can't recall what they look like to be able to describe them - I can tell those tail lights are on a car, but couldn't even say what colour that car was, never mind the make/model. It's just a moving and potentially fatal object and the rear lights tell me if it's braking, just as I'd look in it's side and rear mirrors to see if the driver is looking in them or unaware of their surroundings (soaking up even bit of usable fine detail to stay alive).
15 years biking hard in London and the only accident I had was a priest cutting me up because he didn't see me already on a roundabout and just drove straight on it and into me. I figured that counts as an 'act of god'!
So I guess this is not the same thing even if it has similarities, or maybe some shared elements.
