Try using the Facebook ads and Google Adwords interface for more than one week. Those are the worst interface I've ever seen. Slow and disfunctional, every click you get a spinner, I'm surprised it went to production, using that for more than a week is torture.
As if the spinners were not bad enough, now western web design created the animated grayed out text, which I particularly find an aberration.
Youtube interface is another example. You click on the "videos" tab and you get infinite scrolling without pagination. Killing pagination is a huge usability issue. Comments section with the "Load more" approach, another annoying feature, just load me all the comments in one go please.