I think the biggest casualty of the new design language is that the Calendar, Address Book and Reminders applications (on OSX and iOS) has gone into the toilet.
Tasks that were once obvious how to do such as adding a new reminder are now almost hidden. On older OSX / iOS versions, adding a new reminder had a prominent button on the top right of the screen; press it, enter your details, save it, done. Now? Scroll to the bottom (heaven forbid you have a hundred items) and tap in the blank gap below the last entry and THEN you get the ability to enter something. Gee, that was obvious? Fortunately, we've been at least granted a '+' in that blank gap now, but it is still ridiculous that we have to scroll down to add a task. Yes, you could probably do it faster with Siri but it isn't always appropriate to talk out loud when you're just trying to create a reminder to buy milk when you leave the office.
Take a look at the other personal management applications and you'll find similar oddities. Why one needs to battle with the Calendar to add or edit an item with some fields in there makes no sense unless you're of the school of "use as little real estate on the screen as possible" on our 4K displays >cough< .. it's OK, you can make the dialogs bigger; if we're typing in it, it is obviously the focus of our attention.. 'K?
I don't think this is a case of "you're holding it wrong", it seems to be more that some designer wanted to make an impact; a statement. Instead, you're making peoples' lives just a little bit harder for the sake of your "art". I'm not saying you need to design option monstrosities like you find on Windows and Linux platforms, but instead of finding the balance between design and usability it seems to be leaning far more heavily on unchallenged design.
Of course, we don't know what we're talking about because Apple knows what we want better than us, right? ;-)