You need to express how important your spouse is in your life. However, you need not necessarily rely on grand gestures. You can be with each other and not say these so-called important words and yet manage to convey that the other person is the centre of your life.
Couples should aim for such verbiage in action and interaction. You could do this in small ways: compliment your spouse in front of your friends or parents, send an email or sms and design a personal certificate or trophy and gift it. Or, just give a shouldering kiss or right hug to say that he or she is special