The heart chakra is massive...
Up the spine you go. From the coiled kundalini in the root of your pelvis to the thousand petalled lotus of your divine crown, these timeless chakras are excellent compartmentalized metaphors for various aspects of the psyche as well as our experience of life. Devout Hindus spend much of their lives exploring and ultimately transcending each chakra on their personal journey to enlightenment. Very few ever get past the heart chakra. It is simply too big, too complex, too flammable for most of us to transcend. When we "follow our hearts" we are acknowledging a pathway that comes from our higher self, i.e. messages intuited via the heart from the higher chakras, the extra-karmic realms, the ones we may never get to.
People get down on this enlightenment stuff, and yeah, I can see why. It's vertically integrated, heavy-handed, and woefully unscientific mysticism. But without a doubt, I do notice progress, growth, and even a kind of elevation of spirit as I age. Call that what you will. I'm game for these "higher" levels of existence. I'm game for the churning ride of the heart. A muscle you must explore but mustn't explode.