Preview is one of the most underrated pieces of software in the world today. I make the assumption that Quicklook uses Preview (because surely it must). Being able to hit spacebar on just about any kind of selected document/image type file and see a near instant look, multiple pages and all, is so important. Once you don't have that (move to the Windows world), you realize how much you miss it. And you can, with a sm…
Similar experiences (eg w my 2012 mpb15r). You'll be happy to learn that your "#1 hate" is easily resolved: cmd-tab then hold option key down while releasing cmd-tab. Voila, the minimized window is restored with focus. :)
The philosophy seems to be that the UI is kept clean and easy to understand but the power is always there if you need it.