This is a common misunderstanding about meditation. In reality, the requirements of formal meditation are exactly what makes it work. Just taking a break does not have the same effects at all.

It's really hard to explain why- it feels to me like it's a weird quirk of the mind at times, because of how it only works if you follow the steps precisely.

At times I feel like it's the focus that you constantly bring yourself back into that helps. At others, I think it's the recognition of all the thoughts that are swirling around your head. At others, I think it's the anti-anxiolytic effect of simply dropping your worries.

I don't understand it at all. But it works.