Yep the experience is quite something. Another thing I've noticed, and you likely soon will also, is that Claude only attempts a follow-up if the one is needed or the prompt is structured for it. Meanwhile ChatGPT always prompts you with a choice of next steps. It can be nice, as sometimes the options contain improvements you never thought of and would like, but in lengthy conversations with a detailed plan it does things really piecemeal, as though trained to maximize engagement instead of getting to a final solution.

I find that Claude almost always ends its response with some sort of follow up question, despite my system prompt telling it not to.

I never really used ChatGPT much though so maybe Claude is just relatively less egregious?