We didn't afterschool at all with respect to academics in early elementary. I was frustrated (personally) that ds wasn't given challenging work at school, but at the same time I didn't feel any need to teach academics at home either.
Thank you for your thoughtful post. I'll respond in a few posts as I don't know how to do multi-quotes.
I think this is one focus we can do. We do read a lot, and I can read things that are fun, educational, or both, instead of making DS do extra work or anything like that. He loves science, so science kits are a super fun thing for us, plus Legos. We read Magic School Bus, Max Axiom, etc. And for me they are enjoyable too.