Yeah, but in Windows it's usually supported officially (and documented) and you know they won't completely pull the rug out from under you on the next release. Apple on the other hand will break the API without even telling anyone. How could you depend on such a company?
* Directories are sorted separately as if they're some mystical entity that can't be mixed with files. Makes navigating by typing a PITA.
* List views can't show or sort by the size of directories.
* No spring-loaded folders makes drag and drop a huge PITA.
* I find the disclosure triangles to view multiple subdirectories in a single window extremely useful http://www.bgcarlisle.com/blog/wp-content/uploads/2011/03/Fi...
Just lots of little stuff like this.