I'm fascinated by the oscillation between straight corners and rounded corners every so often. One is popular for a while, then the trend goes the other way, and back again.
Zooming out to 75% improves the experience, but honestly I feel like I'm going crazy!
Being a human endeavor, it always existed in web design as well. There was no -ification. Even the themes of early PHP software oscillated like this.
How do you reconcile this with people complaining about redesigns? I tend to hate them, personally.