It's always, "Oh, I never knew how great it was at the time" and "I know I don't usually tell you how much you mean to me," but I really do enjoy great things at the time, and I'm constantly telling my loved ones how much they mean to me. And if I noticed I wasn't doing it, I would start, I wouldn't just pick up a card and call it good.
You have no excuse for not paying attention to these things, people! Love your loved ones! Enjoy the good bits of your life! That's what they're there for!