Heh, wrote something similar (django-queryinspect) a while ago, then abandoned it since iirc django debug toolbar has it builtin, and I moved to some other stuff.. maybe I should dust it off.
N+1 is fairly well understood and documented gotcha, and Django has excellent tools that make it easy to avoid it (as the article mentions).
To use Django ORM effectively in nontrivial apps, you do need to understand how relational databases work, and it's helpful to understand SQL. But it does make me a whole lot more productive (and happy!) than writing SQL by hand.
N+1 is fairly well understood and documented gotcha, and Django has excellent tools that make it easy to avoid it (as the article mentions).
To use Django ORM effectively in nontrivial apps, you do need to understand how relational databases work, and it's helpful to understand SQL. But it does make me a whole lot more productive (and happy!) than writing SQL by hand.