Yes, that was true for me, Nanban. I'm thrilled for you - that renewed delight in seeing the children each successive time doesn't fade when you've been denied contact for a significant time.
We never know what might turn things round. In my case, it was a judge's disgust when presented with evidence of parental (and grandparent) alienation. We got occasional contact when money was due to change hands, or ex-DIL wanted something no-one else could provide. Other people find that the end of a stifling reationship frees things up for contact, or a sudden realisation that it's not fair on the children.
I would also say never lose hope. Children grow up and ask questions, and will eventually exercise their own choice. My grandson is 13.1/2 now, and he chooses when he can see his dad, takes holidays with him, and has told his mother he likes dad's new partner - 'she's nice!' It didn't go down well, but she knew she couldn't keep my grandson from being with his dad, not wihout risking him moving out to live with him. Her threats - 'we will be homeless and penniless, your dad will stop coming for you, your nana has got other grandchildren now' have proved to be nonsense, and grandson now has some power. This is what other children can do as they start to examine what has happened, where loving grandparents have been denied contact for no good reason.