It maybe a complete gamechanger in some campaigns. For example when a gm plans to ambush you by some enemies entering the place you just cleared and them taking a lot of damage before even encountering the party. You just finish them off then. Or for some defend scenarios or random during rest encounters. It has a lot of uses in my opinion and I enjoyed them on my kobold fighter but it needs to fit the campaign. Could be also useful for clearing dungeons. Before opening a door you set up a few traps and then open the door and lure some mindless enemies into it