> Maybe I don't remember how to stitch something together, but i know it can be done.

That's how I use the current AI, too. I never ask them to do something without specifying how it should be done. I ask questions first, use /plan to let the model ask me questions, then I let it execute the plan while reviewing the results. More and more often, I get something close enough to what I would have written. In the opposite case, I at least know exactly how to rewrite the result, if needed.

I observe the same effect as you: while it does sometimes speed up the implementation a bit, it's not very noticeable; however, it frees me from having to recall all the obscure little details up front. Instead, I can describe them, have the model implement them, and then recognize them (and refresh my memory) when reviewing. The effect is that it's easier to start a task because I don't need to prepare as much to execute it. It's especially notable on things that I haven't touched for some time. I know, more or less, how my Elixir projects are set up, but after ~2 years of not working on them, getting back into them had been a hassle - with AI, it's no longer that. I think the biggest difference comes from the AI lowering the cost of context switching for me - I used to have huge problems with that, and AI certainly helped a lot.