The garden is huge (190 acres) and has large ponds that help to separate and define the spaces. But most important, as a feature of a great garden, it gives you a chance to pause. They have adirondack chairs and benches placed throughout, compelling you to sit in them. There were many people sitting in the shade reading books or just quietly lost in their own thoughts. This sense of peace and tranquility is what's been so elusive in my own yard. Maybe it's just not lush enough to provide that enveloping cushion of silence.
I leave awed, inspired, and at peace all at the same time. THAT, is what a great garden is.