Interesting. Thanks for sharing.
I'm curious about something a bit different. Given a vim buffer, and picking two caret locations in it, I'd like a tool that shows only the paths to getting there with my current Vim setup (including all the plugins).
After 10 years of using vim, I rarely use L and H. For horizontal moving it's almost always F or S (vim-sneak).
More often than L and H, I use { and }, which jumps across paragraphs (i.e. blocks of lines separated by blank lines).
I've found that most of my code consists of 3-5 line blocks, and { and } feel like a nice medium-range navigation tool, because oftentimes CTRL+D jumps too far.
The downside is that both of these jumps go into the jump table, so they will clutter your CTRL+O history a bit.
But I think I'm weird in this regard.
I rebound ctrl+j/k to scroll about a third or fourth of the screen (~20 lines?) as an alternative to ctrl+d.
I've been using { and } more as well. Mostly to navigate paragraphs of prose, but sometimes for code too.
Yeah, I did the same for shift+j.
When I experimented with scrolling, I found it hard not to lose understanding where I just scrolled from. What helped immensely was defining a top and bottom margin and using vim-smoothie.