I'm old so I watch everything with closed captions. It definitely makes it easier to understand what they're saying.
I started using closed captioning with DVD's. I got tired of turning the volume up to hear what they said, then having to turn it down when loud music played or the sound effects got loud. I record every TV program I watch, and keep the closed caption option on my cable box on all the time. That way I don't have to constantly rewind the program to hear it again.
Several years ago I started using headphones with inline volume control for my TV. I use them primarily for the varying volume and background noise and characters who whisper. They also reduce the outside noise in my apartment complex.
I have worn out 3 sets, so far.