Take Facebook for example. It used to be a perfectly simple website, with easily navigated walls and news feeds. But that wasn't good enough for the buggers. Now we've got TIMELINES. With posts and pictures all over the bloody place, making it headache central if you're trying to find some specific info.
Another example is Snapchat, a delightful app allowing you to send pictures to friends for free. The previous layout was simple and instinctive to use. Now it's just a bloody mess!
I'm such a cantankerous old mare, but surely someone out there can agree with the moral of this story: if it ain't broke, don't fix it. 'Cause "fixing" it will just piss me right the fuck off.