Aside from the new look and various Handoff stuff I havent really seen anything mentioning the smaller tweaks introduced in Yosemite. Heres some I have found. Any others?
- In some applications you cant tab to other buttons in a dialogs such as file already exists and Do you wish to save. You have to do Cmd-letter instead.
- Finder: When right-clicking on a file and choosing Open With, a menu initially appears with the message Fetching .
- Finder: New menu option View > Show Preview
- Finder: The Where field in Get Info shows triangles as the folder path separator. You can copy and these but thats pretty useless for e.g. pasting into Terminal.
- Preview: In the Markup toolbar, a new zoom shape adds a circle with the contents zoomed in (like the Loupe tool) and a fade tool dims everything outside the box you draw. There is also a new Sketch tool. Some commands previously only in menus now have buttons here, e.g. Adjust Color and Adjust Size, and i think there are more colour options for line and fill. The text formatting button provides some easy options but does not give access to the standard OS X font palette.
- Preview: Notes (i.e. annotations in PDFs) are printable. (Maybe this was earlier versions too?)
- Preview: If you want to print a graphic that fits onto the paper, the default size of the graphic is 100%. In previous versions, Preview would default to making the graphic as large as possible. (My no. 1 favourite feature of Yosemite!)
- Calendar: No longer possible to delete events from the Get Info/Inspector windows (something that was rather too easy to do in previous versions because the button was in the same place as another button in a different view)