I have a current project where I am adding new filters to large existing dashboards. Going through each card and wiring them up to the new filter with SQL variables and choosing the right field filter in the UI takes a while.
If there was a “Recently Used” section at the top of the field filter selection dropdown that showed whatever table+column combos I had used in the last N cards, it would probably cut my editing time down by 90%.
Not sure how much it would affect others but it would be a huge positive impact for me at least!