Good writing has an aliveness that keeps the reader reading from one paragraph to the next, and it's not a question of gimmicks to "personalize" the author.
William ZinsserNever say anything in writing that you wouldn't comfortably say in conversation. Be yourself when you write. If you're not a person who says 'indeed' or 'moreover,' or who calls someone an individual ('he's a fine individual'), please don't write it.
William Zinsser