Ross Carter nails exactly what’s wrong with Snow Leopard’s abandonment of creator codes:
“For documents that are recognized by multiple apps, the user has the power to bind a particular document to any app they wish, using the file inspector in Finder. So at least for this purpose the creator code is not needed.”
Two words come to mind: puh leez. In what universe do people create a file and immediately, whistling with merriment, go to Finder and change the application binding for that document?