Some holes on my web-surfing experience because I block Flash content
Fact of the matter is our machine is only a 1.83 GHz Mac mini with a 1 GB RAM on board. It does not handle Flash content so well and even if it does, it just makes the web too cluttered for my taste.
ClickToFlash is one of the extensions you can use to install in your Safari browser and it does its job really well - (1) it blocks Flash from running but allows you to click on it should you want to, for whatever reason, view it and (2) if available it loads a Mac-friendly H.264 version of any Flash video.
And with ClickToFlash's placeholders that are elegantly designed, I'd rather see those "holes" rather than those pesky flashy elements.
If you're not using Safari yet, learn all about its goodness here.
