My biggest pet peeve is docblocked-to-death code, like

    class Widget
    {
        /**
         * @access public
         * The name of the widget
         */
        public $name;

        /**
         * @access private
         * The widget's material composition
         */
        private $composition;

        // ... yada, yada ...
    }

Even with syntax highlighting on, it can be a pain in the ass to see the code through all that comment noise. I guess I should take the time to configure my folding more.