If I'm multitasking and watching a movie, I definitely understand the sentiment. If it's a drama and it has subtitles, I'll pick something that doesn't require my eyes to be on the screen full time. But with action movies, I'm looking at the screen the whole time anyway, so subtitles are not a big concern. I find that you can't help but read words in front of you, like it's not even something you think about, so there's really no difference.