Well, by golly, I was born when Neptune was less than 3 degrees from the IC in the 4th House, retrograde in the last degree of Virgo, Neptune's sign of exile. As the most angular of all my planets it is a very powerful, yea dominant, influence in my life and has been for the past 76 years. I have some experience with Neptune.
The 4th House and IC symbolize Roots. Neptune is a symbol of Dissolution. From early childhood...well, I used to style myself a Tumbleweed, bouncing along before the wind whenever and whither it blew. No roots. But I've been in the same place for 17 years now; gathering moss.
Ditto Family. Not a single member of my family from any one of the three generations, speaks to me. Dissolution of family. A veil of delusion separates us.
Dependency. Alcoholism. No longer. It just went away about the same time I came to this little town in the middle of the northern desert.
Mysticism. Deep Faith in the universe. Strong intuition. Seeing beyond the veil. But keep it real; Neptune is in Earth, and I have strong Earth in other places in the chart.
A long time ago I went to a big astrology convention/seminar thing in Houston. One of the seminars was titled "Planets on the Angles". When the speaker came to "Neptune on the 4th Cusp" her first words were "Mama was a Space Cadet". I **** near fell out of my chair laughing.
I could go on....