Gaming

I find that if subtitles are on, I'm distracted reading them and not focusing enough on the game.

For this reason I'm often turning them off. I can read very quickly, but I'm easily distracted by the tiniest things.

I have them turned on since I am not a native english speaker and want to understand everything correctly.

I used to practice my foreign languages by having the dub vs sub be different languages, worked well enough imo.

I always use them whether playing a game or watching a film; definitely if I'm watching a documentary.

Can't say I'm surprised. My partner both do this for movies and games, because we either can't hear the dialogue or freak out our dogs with the sound effects

I prefer subs even when playing video games and watching movies/TV in my native language. However, I think part of why gamers prefer it is movies are at least scripted to the point where it's unlikely that a loud noise will go off in the middle of an actor's line. In a video game, there could be dynamic sound effects at any time right in the middle of a line.

For videos I try to turn subtitles off if possible, I find that they do distract me from watching other details on screen. However a lot of times I find myself switching subtitles back on because the dialogue is hard to make out over the background sounds and effects.

Sometimes after watching, say, a TV episode of some show I go online and check the discussion, when I would come across a question somebody asked and I would wonder "Why would they ask that? It was so clearly stated in the show" and then I realized I had subtitles on and was able to read it clearly, whereas another watcher could have missed / misheard those dialogue if he/she didn't turn on subtitles.

Apparently I'm in the minority here.
Subtitles drive me insane, and I always turn them off. My eyes always get drawn to the subtitles so I miss what's happening onscreen. I also read faster than the dialog is spoken, but my brain gets interrupted by the spoken dialog while it's processing what I just read, so I get the same information twice but struggle to retain the actual meaning. I have no idea how anyone can tolerate subtitles unless they actually need them.

I tend to watch everything I can with subtitles these days, watching old stuff again it's amazing just how much I was missing, either through sound design issues or just zoning out momentarily. The only issue is when the subtitles get ahead of the dialogue and you end up with a bit of a spoiler, albeit only by a few seconds.

I've also discovered some absolute gems of sounds/music being subtitled, one of my favourite ever being from the TV show Taskmaster, the sound effect of [he strums balalaika tunelessly], which added so much more than just hearing him strum tunelessly did.