I have cut my driving from 30,000 a year to more like 300 miles a year these days and you could ask "why"?
a) I have no need to travel long distances with heavy equipment any more
b) I prefer to travel by public transport as it's more relaxed, more social and greener
c) The only car we have left on the road has a 150 mile range - electric car now 7 years old
d) Whist my eyesight has changed, it is still very easily legal (professionally checked a couple or months ago)
e) I do not feel as confident driving in the dark as I once did (is this the "fear" talked about??)
f) I know that at some point I won't be able to drive and don't want it to be a shattering life change when that happens
g) Too much hassle on many shorter journeys driving in traffic jams and parking; better to allow a few more minutes and walk or even cycle.
h) Cheaper to get the bus into Bath than pay for parking
i) Not travelling as much with multiple family members i.e. children, etc, where car is more efficient

 
My annoyance is drivers who sound their horns at other motorists who think they have been wronged by other drivers.

If drivers have got time to sound their horn,they have time to to avoid "the issue"

 
In a former life, did 50k a year in and around the South East.  Came to the conclsion that the M25 in particular was going to be the death of me. Returned home to Cornwall, and now drive no more than 10k a year.

Rarely leave Cornwall in a car these days, would rather take the train...

 
The state of some driver's driving ability leads me to understand that feeling....a lot is apalling, especially foreign lorry drivers

 
https://www.bbc.co.uk/sounds/play/p0m0fqy7 (only available for a couple of days)


https://en.wikipedia.org/wiki/Driving_phobia