I am very fond of things akin to vim's 'showmatch' mode where when I close a paren or block or etc. the editor highlights the opening element for a second or so and then returns to baseline.

(I have almost no -ambient- highlighting in my baseline but I know lots of people who do and still derive great value from showmatch for the feedback - from discussions with other people rainbow parens style lisp modes seem to provide a maximum overkill approach to that question but I very much prefer maximum underkill in my own tooling even while wanting to be very sure I'm not making it unduly difficult for collaborators with opposite preferences)