My goodness the internet is a dumpster fire without it. So many pages lagging and slow to load. Things I wanted to click that jumped when an ad loaded resulting in miss clicks. Annoying things following me around.
It was especially bad on mobile with the GDRP/Cookie notices and ad's to the point that on my iPhone SE some pages had a thin smear of the actual content no taller than a single line of text. News sites were especially bad for this.
With the experiment ended my pi-hole and ad blockers are now set to very on (and updated to this version and can confirm the block list went from 100,000 to 89,000) and I am much happier. Seems about 20% of the traffic on my network is blocked now which explains why some pages performed so awfully.
The ad industry really needs to up its game because the current state of the web is just horrible.