All kinds of tools are available to manipulate the presentation layer. The templates are built in seconds, thanks to helpers. The layouts, partials, components, and component slots bring both modularity and reusability. The view configuration takes advantage of the speed of YAML to handle (mostly) page headers. The configuration cascade exempts you from defining every setting for each view. For every modification of the presentation that depends on dynamic data, the action has access to the sfResponse object. And the view is secure from XSS attacks, thanks to the output escaping system.
The definitive guide of Symfony 1.0