This is something I keep bringing up with my fellow PHP developers. I like the simplicity of PHP in some respects, however the syntax and various frameworks seem to be constantly evolving around my projects. I have friends who are constantly having to adjust their code to comply with the newest release of CakePHP. I find some syntax (pseudo-)rules and best practices in PHP have changed enough to make it a constant struggle just to keep on top of these changes along with trying to improve my abilities in other areas. I'm all for new features but I'm beginning to grow weary of the time spent staying on top of trendy languages (PHP vs Python or Rails, SVN vs git). I would much rather spend this time learning better security practices along with design and architecture. I would never state that change is bad, I'm merely stating what I now see as a drawback of these constantly evolving languages.
... I really hope I'm not becoming one of those really old dinosaurs who refuse to learn anything new. ;)