This is my experience as well. You gain self awareness and it helps your focus. I haven't experienced ghosts or orbs myself. The author should question his own sanity instead of being concerned with others.
Your positive experience doesn't discount others' unpleasant one. Through meditation you can reach deep into the unconscious.
The safe approach is to start with practices that get you more in touch with the body, that get you to become more aware of the body. If you are grounded in the body, it's a lot easier to face whatever unpleasant emotions or sensations might come up.
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