The current wave of CSS3 effects are very much akin to the early days of Flash. Oftentimes it's a superfluous effect that hampers readability or usability, and I sincerely hope some lessons were learned from the Flash heyday. Just because you can move your content in 3D, add transitions and effects -- all in browser-native rules -- doesn't mean you should.

I'm on a pretty beefy Macbook most of the time and there are a lot of simple-looking sites that are almost impossible to use because of the slow-down from their page effects. The scrolling behavior from parallax or fixed effects really seem to be the worst.

If you want to see the next wave of CSS effects, just check out one of the old copypasta providers like DynamicDrive or FlashKit. ;)