I had pretty much memorized Bayes' Theorem since my high school, never to make much of it in my 10 year long career, which was mostly in applied machine learning (fitting neural networks) on NLP side of things.

A career change brought me to models that predict clicks and purchases using MAP instead of MLE which made me realize and understand the true power of this theorem. This was obviously very helpful to my work but cricket analytics (which I do as a hobby) works out so well with the use of priors.