People like myself with extremely limited bandwidth see the difference. When I load a page from wherever, that is loaded with adverts (often enough, flash powered) it might take a full minute to load a page. All that bandwidth wasted, just to read a few lines of text, that should load so fast that I don't actually SEE it loading.
One way to stop all that trash loading is to use your HOSTS file, or some other proxy that filters out the advertising, since most of the advertising doesn't even come from the site you're trying to load.
I know - since much of the world has fiber optics, most site developers simply don't CARE that loading their page takes 3 minutes in the less developed world. Believe me, I don't use their site, if I can't block the garbage.