Me too. I heard this phrase at maybe too young and age and took it completely literally, so it clouds my judgement of it a bit, but I still cannot shake the view that it is 100% on the money. The brain wants to "solve" your issues, ideas, hang-ups, anxieties, ("solve" because sometimes having no solution is the solution and that is valid) it just needs us to give it the space to meander through it. But we keep finding more and more novel ways to interfere and stop it from doing that most noblest of things.

As a related aside, that's why I continue to find it odd that many people take their phones when they're using the bathroom. Just further limiting the few places (with the shower being #1) where circumstances does force your brain to review and assess like it clearly wants to do.