The thing that I think is the most important is taking moments to express your appreciation to your partner. A thank you or a quick kiss can go a long way toward affirming your relationship and commitment to each other. That's not hard to do even when you're juggling insane careers and three kids.
I understand now that the vulnerability I've always felt is the greatest strength a person can have. You can't experience life without feeling life. What I've learned is that being vulnerable to somebody you love is not a weakness it's a strength.