IMHO, the true value of being able to “write on command” is not self-expression, or wandering into the mind’s fabulous realms. It is looking at the everyday experiences of life-what others consider mundanity and junk-and being able to reach in that “trash pile” and pull out polished riches. As a writer, you knew that those gems of wonder, horror, and wisdom were there all along, all you did was train yourself to look.
In a sense, you’re like a mental Macgyver. Actually, I prefer Batman. 😉