Ok, the time has come I'm releasing a stand-alone package for pcsx2/mac 0.9.6 which doesn't require launching terminal whatsoever, hope that helps. The steps to install it are as follows:

• xQuartz
  To run Pcsx2, you need X11 but not the one that comes with Leopard/Tiger. You can download the latest release of X11 from the XQuartz Project page. Double-click on the package to install it.
• NVidia CG framework
  Download the package for Mac OS X here. Mount the disk image and double-click on the installer. Follow the instruction to install the Framework.
• PCSX2/mac + plugins
  The latest package is always here. This will install all the necessary runtime libs and put the application bundle into your /Applications folder. The rest is as simple as double clicking it.
  

P.S. Thanks go to nestorespinoza for the icon

Does it work with the Snow Leopard X11?
and does the nvidia package work on SL, too?

Yes, it does work with SL X11 without xquartz as far as other users told me