When I open a file, I fold everything (zM) to get an overview of the file. Then I slowly unfold as I'm browsing, ignoring the parts I don't care about. I set the repeat delay super low and repeat rate super high on my keyboard and just navigate around by holding j/k or {/} (for large folds). Since everything is folded, you're moving about pretty quickly.
If you're looking to use the 20j stuff, you can `:set relativenumber` so that vim shows you line numbers relative to the selected line to avoid counting. I couldn't get used to it.
There's also Hop[0] if you want to go the plugin route.
I've always wanted a sort of "hybrid" line numbering scheme. Show me the relative numbers in one column, and the absolute line numbers in another column. You can set up vim so that the absolute number appears on the line your cursor is on (and the other lines display relative nums) but this isn't quite enough.
If you're looking to use the 20j stuff, you can `:set relativenumber` so that vim shows you line numbers relative to the selected line to avoid counting. I couldn't get used to it.
There's also Hop[0] if you want to go the plugin route.
[0] https://github.com/phaazon/hop.nvim