For me, a "trigger" is something that makes me emotionally upset. When I immediately react to the emotion(s) without acknowledging what previous incident I am replaying, it can end up causing a problem and/or fueling more of the same emotions. I have a tendency to overgeneralize many words. Once I get in the habit of using a word properly--I multipurpose it to much. Maybe this is the tendency you are noticing. Plus, this word is used so much at PC perhaps that fuels its use.