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 can't imagine gaming without them, and I wished all devs went the extra mile to include subtitle scaling/ sizing.

I always enable subtitles. Most games still only have English voiceovers or terrible dubs and since I'm not a native English speaker, it's easier for me to follow the story with subtitles enabled.

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

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 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.

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

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

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

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.