my favourite feature is how the title bar icon in any app that’s editing a file (textmate/ word etc) is a pointer to the actual file unlike windows. - you can drag that file anywhere to move it. - CMD click it to see a breadcrumb menu showing where it is and navigate to the folder on a similar vein, dragging a file into an open file modal box makes it browse to the containing folder. In windows, dragging a file would…
Similarly you can right click the window title (click with two fingers on the touchpad) for this functionality. It's very useful to navigating up in the folder hierarchy in Finder without adding any new icons to the toolbar.