I only literally do an expected outcome calculation when I care more about having numbers than I do about their validity, or when I have unusually good data and need rigor. Most of the time the uncertainties in your problem formulation will dominate any advantage you might get from doing actual Bayesian updates.
The advantage of the Bayesian mindset is that it gives you a rough idea of how evidence should affect your subjective probability estimate for a scenario, and how pieces of evidence of different strengths interact with each other. You do need to work through a reasonable number of examples to get a feel for how that works, but once you have that intuition you rarely need to do the math.
r/Fitness does a weekly "Moronic Monday", a judgment-free thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. I thought this seemed like a useful thing to have here - after all, the concepts discussed on LessWrong are probably at least a little harder to grasp than those of weightlifting. Plus, I have a few stupid questions of my own, so it doesn't seem unreasonable that other people might as well.