There are many German things that I love. Three of them are the Leica, the Audi, and the Omega. OK, Omega is Swiss but they speak Swiss-German so I'm counting them.
There are few extraneous lines or shapes in these designs. Buttons, markers, and curves nearly all have purpose. Even that leatherette casing on the bottom of the Leica is there to make it easier to hold. There are no numerals on the Omega because they would clutter the face and make the added precision of the second markers too hard to read - and you don't need them. It's a clock, you know what the tick marks mean. In the case of the Audi, its now-famous daytime running lights are not Xenon gas (which burns out but is brighter than LED) but are a series of LEDs, carefully sculpted into a patter that is visible and provides enough surface area to accomplish the mission.
The lesson the Germans are teaching us about beauty and slickness in software is that they are the product of dedication to careful technical design. Reduce the necessary functions to what they need to do and no less, organize them carefully around the user, and don't add a lot of spinny-glowy-showy crap. That's how you make a product slick.