It doesn't stop you from running adblockers on devices in addition. As it takes about 10 mins to setup it's totally worth trying out.
That doesn't solve the problem when you're out of the house although you can set up your devices to use your pi as a dns server when you're away from home.
2) You get nice graphs. This is surprisingly addictive. I’m just trying to feed it into Grafana now, to make one dashboard to rule them all.
3) You can block other stuff easily, which is handy for sites you don’t want visited accidentally (which is also possible in my adblocker).
4) Removes DHCP and DNS from the crappy ISP router.
5) It’s on a Pi and as mentioned elsewhere here, that somehow makes a chore into something fun.