I think it depends on what you are doing the side project for.

Are you doing it to learn engineering? The learning potential of a back & forth with LLMs is wasted on people who don't have serious know-how.

Are you doing it to create a product, or learn how to do that? Then no, the LLM is helping you get over the hump of writing slow code.

I think we'll eventually drop the "vibe coding" and retronym coding to "slow coding" or something similar. There's advantages to slow coding in a world of AI coding, just like today there are advantages to dropping other types of abstraction layers (from writing direct code when using a WYSIWYG editor, to dropping into assembly code in a performance-critical branch of a game engine written in C++...).

But spending more time on writing code is not useful if you don't get something out of that additional time.