Except you don't know, before you go to it, whether any random site is going to hit you with 47-bazillion tracking cookies, load ads from 17 different ad networks, pulling down high-resolution images, malicious scripts, etc, etc.

It's gotten bad enough that I'm using my hosts file to block all this garbage, so requests to any of these sleazeball advertisers and trackers just 404. I'm amazed at how awful the internet is when I have to see all the sludge that advertising sprays all over it.