There's one prompt in ZSH, the adam2 prompt[1], that I completely fell in love with due to the automatic horizontal rule since it makes tracing histories so much easier when dealing with long-scrolling outputs. I've never been able to find a similar feature in another prompt/shell, nor have I had the inclination to try and replicate it, but I'd be much more inclined to switch shells/try new prompts if that were available.

[1]: https://imgur.com/1X9bY8X