I don’t really use closed captioning–except when I’m watching The Great British Baking Show or some other British show. That’s just because I don’t speak British, so the subtitles are necessary. I mean, honestly, what are they saying? I do not know.
My daughter, on the other hand, always has the closed captioning on when she watches TV. It helps her focus, she says. Without it, she won’t really know what’s going on.
But, for me, it’s hard for me to focus when closed captions are on. I read instead of watching. It is very distracting.