I really like Elk Buff Bars (Ace mod) for this, timer bar > swirly icon imo. Pretty sure there's several mods that do this but I think EBB hits a real sweet spot between ease and power of configuration. This SS shows how one can use EBB to create a set of bars that filters in only buffs / debuffs that you want displayed in that set (above player and target unit frames).
This thread should maybe be in the UI forum.