I know what you mean, OP. I loved my children very much - but maybe because life was so busy with them and work, I never really appreciated how much I loved them. Now I have grandchildren - two I see every day because I'm their co-parent with my son . I love them but it's an "everyday" sort of love, like I had with my own children.
My daughter lives far away, and one of her children has a disability. Miss M as we call her, is the most loving child I've ever known, and she overcomes her disability every day with such courage , it stabs me in the heart to think of her. She Facetimes us a couple of times a week, and just seeing her face makes me melt. This love is so special, I feel sorry for anyone who hasn't had it in their life.