I know a person who chose not to read something (MAX Punisher #1) based on my warning of explicit sexual violence. Anecdotal and incomplete, but most of an example case...

I have chosen not to consume media (including but not limited to text) because of an explicit trigger warning. Not often, though; most trigger warnings relate to topics I don't have trauma about. More often, I have chosen to defer consuming media because of an explicit trigger warning, to a time and place when/where emotional reactions are more appropriate. I have consumed media in the absence of such warnings that, had such a warning been present, I would have likely chosen to defer. In some cases this has had consequences I would have preferred to avoid.