While i like ActionDurationReminder keep it mind it only registers mouse-clicks. It may occur you click your buff but for some reasons it did not go off - in this case ADR still shows the buff that is not there.
S'rendarr is much more accurate since it actually registers the buff and then displays it. Also you can move any buff(s) you want to focus on to an aura window you like. For example type the name (or the ID if enabled in S'rendarr) to the whitelist.
You can also move the (whitelist) aura frames so you see them very easily apart all other stuff going on.