As a program manager with Portfolio, many groups, each of which has multiple teams, I have many filters.
I even "favorite" the cream of the crop: the top few percent.
But I still have so many, and the first few words are often the same because I need to use the same "codewords" up front so they get collected together in the sidebar; I need to tug the sidebar open to see whether I'm hovering over "Team X Portfolio Plan" or "Team X Portfolio Epics and their children" or "Team X Portfolio orphan issues" etc. Going into Manage Filters to search pulls me away from what I'm doing and then I forget what I was looking for.
Wouldn't it be amazing if the left sidebar for favorite'd filters were something where I could group, sort, expand/collapse etc to organize my filters?