I was a physics TA in grad school. I was very good at explaining solutions to problems, so of course during exam reviews I would get big crowds to watch the explanations. I was also somewhat aware of this principle, so during a review I was trying to get students to come up with approaches or ideas while solving a problem, and they demanded "why don't you just tell us!" It was pretty frustrating.

Watching someone explain solutions well can be dangerous, since it gives you the very real feeling of understanding, without actual understanding. To actually understand, you have to try a problem from scratch. Then you will understand why the solution/approach is what it is, and why other approaches fail, which will give you intuition about which approaches work on future problems. But counter-intuitively, you will get lost in the weeds during the process, which makes you feel like you don't understand!