I only actually realized the "writing is thinking" since ChatGPT became a thing.
Sometimes I try very hard to describe my problem to ChatGPT. Then... I don't even press send, since in the process of describing my problem I've garnered enough "thought points" to solve the problem myself.
I do the same when having to formulate an email to ask a colleague a question.
In the writing of the question I realise I know parts of the answer and can actually ask a more specific question covering the gaps of the answers I worked out.
Sometimes I try very hard to describe my problem to ChatGPT. Then... I don't even press send, since in the process of describing my problem I've garnered enough "thought points" to solve the problem myself.