User blog comment:Kirkburn/Syntax highlighting - helping you read and write code/@comment-452-20150408160608/@comment-452-20150408175400

While the blog post does indeed state "There is no user preference to turn wikitext highlighting on and off.", the dev who implemented it obviously made the same assumption that I did when I thanked you for planning to make it optional via user preference: that the option was intended to cover both, since both forms of syntax highlighting were being introduced at the same time.