They are the easiest I've found and also the most versatile. For localised effects like the teeth etc it's a case of running the action and then simply painting with a white brush. Personally I find this a very simple and intuitive way of working.
Many are "1-click and presto" but you can also...
There are some actions at http://www.1clickactions.co.uk that use layers and are very good as an alternative to the standard Dodge&Burn tool in Photoshop. They are in Volume 4 also they do toning and split-toning actions in Volume 2