I gave some of them in post #25. Here are a few more.
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The engine braking effect is stronger in general. In fact, for some kinds of dense traffic (the usual claimed weak point for manuals), this leads to an easier driving experience. When traffic is slow, but not complete stop-and-go, I can often stay in 2nd gear, vary my speed between around 8 and 30 mph, and never have to touch the brake. If I leave a decent gap ahead of me, I can handle a little bit of stop-and-go.
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Manuals allow you to accelerate more quickly without (necessarily) increasing fuel consumption. Engines are most efficient at wide-open-throttle, but are less efficient at high RPMs. With an automatic, if I floor it, the transmission will decide to increase my shift points, leading to a decrease in efficiency. With a manual, I can floor it but still shift at the normal RPM, which means that I am achieving peak acceleration for a given level of efficiency.
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Driving up hills in an automatic is often a recipe for constant shifting. This is not only hard on the transmission, but gives unpredictable throttle response.
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Manuals force people to learn how to drive with one hand. The two-handed 10-and-2 monkey grip that everyone was taught to use is, IMHO, terrible–you lose the fine precision that your fingers have. Its only place is parking-lot driving where you need fast hand-over-hand turning.
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I can push-start my manual in a pinch :).
When shopping for a car, did you pay any attention at all to the horsepower? If so, why? I’m sure the lower-powered car “works” when it comes to acceleration. Of course, you recognize that there are many situations where high acceleration is important, and even utterly critical to safety, such as merging into traffic or passing a car. Maybe you got the low-powered car anyway for other reasons, but surely you recognized that high power is an advantage on its own.
The same goes for manuals. You have every right to dismiss their advantages as being unimportant compared to their subjective difficulty disadvantage. But to essentially say that their advantages are zero is a statement of ignorance–the advantages are there even if you don’t know about them.
It’s likely that you’ve been on hairy the edge of control more often than you know about. Maybe you didn’t spot that patch of black ice or oil, or maybe you were hydroplaning and didn’t notice. Extra control is always useful even if falls below your awareness.