I think, for theless experienced(read just starting out) developers, understanding a framework like Symfony2 will be the as complicated as any other framework in any other language.

Trust me, I have seen "senior developers" with years of experience doing HTML-PHP spaghetti style coding(and nothing else) going bonkers when asked to do something in a framework as simple as CodeIgniter - let alone more complex systems like Symfony2 or Drupal.