Marchy, mostly not as bad as in your first paragraph... but then again, sometimes...
Here in South Africa we have one of the highest per capita accident and road deaths. We live and ride mostly in mountaineous rural area with a mixture of fast cars and slow moving trucks and single lane roads.
With a car tailgating (or sissybarring) waiting to overtake I prefer to signal early. Waiting for oncoming traffic to pass, I then sometimes found that 10 seconds have elapsed and I am sitting in the middle of the road, exposed and about to do something another driver is not aware of. Rare exception and not the rule.
Got used to it now, but frankly, after a lifetime of manual cancel, methinks maybe I prefer it.