This is the part I don't get about vibe coding: I've written specification documents before. They frequently are longer and denser then the code required to implement them.

Typing longer and longer prompts to LLMs to not get what I want seems like a worse experience.

Code is a concise notation for specifications, one that is unambiguous. The reason we write specs in natural language is that it's more easier to alter when the requirements change and easier to read. Also code is tainted by accidental complexities that they're also solving.

Because saving hours of time is nice.

I don't cajole the model to do it. I rarely use what the model generates. I typically do my own thing after making an assessment of what the model writes. I orient myself in the problem space with the model, then use my knowledge to write a more concise solution.