A good pair of headphones can let you hear more details in the soundtrack! Using headphones to catch up on shows late at night is actually a better experience.
From a soundtrack fan's perspective: music is the anime's biggest advantage. Without Hiroyuki Sawano's soundtrack, Attack on Titan's impact would be halved.
Professional opinion from a soundtrack enthusiast: The function of an ED is to help the audience process the emotions of the plot. Therefore, a good ED should "soothe" rather than "stimulate."
From the perspective of a soundtrack enthusiast: some BDs come with a bonus OST CD, and that is actually my biggest motivation for buying BDs.
Pilgrimage to anime locations paired with the soundtrack is simply a perfect experience. I like to wear headphones and listen to the work's OST while at the location; it doubles the emotional impact.
I have an OST recommendation! The most suitable track for Valentine's Day is "Ushio" (潮鳴り) from CLANNAD; it's so gentle it'll move you to tears.
I'm most looking forward to the new soundtrack! Kyoto Animation's soundtracks have always been excellent. I wonder if they'll be collaborating with a new composer this time?