What I like about SponsorBlock is the statistics it presents. Every sponsor segment I've contributed has saved 682 people from seeing it. Per each submission I've contributed by spending maybe 1.5 minutes, I've saved 459 person-minutes. Wow. What an impact.

I didn't know about the stats, I just checked and found it's saved me over 3 days. I assume that's local to this machine, so that's just in the last year.