As someone who has never used sublime I don’t get the analogy, but what do you like about herdr? Is it worth using? I came across it along with hunk at the same time and I’ve been using hunk a bit but didn’t really see the appeal of herdr over just my usual batch of terminal windows.

Herdr is my daily driver. It is lightweight and snappy while also being customisable (hence the Sublime Text analogy). I like that, while it supports tmux-style shortcuts, you can also use the mouse, so the learning curve is very gentle. In addition it's cross platform (Mac/Linux/Win) which is great for me because I needed something I can use on different machines.