I dislike the modern MacOSX finder, I dislike modern applications doing their damndest to avoid daring to open another window and shove it all in the same window making it truely difficult to drag content from one folder to another.

I was brought up with GUIs that in order to move files you did a drag&drop. I dislike the modern expectation that you'll be using the clipboard to transfer files. It goes against my mental model of whats going on, because the file does not go into the clipboard, it's all a lie!!!!