The best PHP IDE now in production would be Zend Studio, but it's not free. So the closest would be Eclipse PDT, but you don't like it.
Aptana Studio for PHP was a lot better, but was discontinued, and Aptana became an IDE for JS and Ruby now, but I tried to save what's left of it, so it's still available.
So far I didn't find anything better than Aptana Studio for PHP.
Big throwback though - it only supports syntax of PHP 5.2.
Aptana is also one of the greatest IDE for Javascript, and HTML+CSS editing is also a step further than in NetBeans (code completion for CSS selectors, based on HTML).
Aptana also has support for Smarty template engine, which is great for me.
Best part - no installation required. Just unzip and run. It only requires JRE to be installed, and most of us do have it installed. And, it may create conflicts with Eclipse projects, so for a clean experiment, open a project that contains no Eclipse service files.