The Automators podcast with Rosemary Orchard and David Sparks, episode 86, was on the topic of “Micro Automations” and included a nice discussion about PopClip and some clever ways to use extensions:
The main PopClip talk starts about 47:14 mark but the whole episode is really interesting.
I used someone else’s machine the other day, I thought the OS was broken, it just turned out they don’t use Popclip! MacOS without it is ultimately harder to use!