Sponsorblock has been a Godsend for me; it's something you don't really think about but adds up. The sponsored segments are not even really the biggest advantage, it also skips intros and outros and interaction reminders, which are huge.

I am convinced that being really aggressive about blocking advertisements helps with my ADHD and helps me focus better. I don't have science to back that up, just my anecdotal self-reported experience -- but I see improvements every time I get a little bit more purposeful about blocking ads (and not just ads but intros, boot screens, social reminders, suggested articles, etc -- basically interruptions). And when I see ads now that I'm no longer desensitized to them, they stick out so much and they're so hard to ignore. Our brains are good at filtering things out, but I do wonder if there's a focus cost in addition to a time cost. My mood improves when my house is clean and organized; my mood also improves when my media consumption is organized and de-cluttered.