It helps me a lot and isn’t anything like cramming grammar. I often have been able to answer a question of a native(!) about Spanish grammar, while I reject learning grammar in a formal way. Everything comes from inductive learning (input, sentences) and the notes I add now and then to a sentence I add.

P.S. How did you make the Anki diagram?

I have a small book of spanish verbs, 300 Spanish Verbs. It is definitely not something I drill on, or study regularly, but it is something I find useful to refer to on occasion to double check a conjugation. I have also been checking out other spanish textbooks and grammar books from the library, but almost totally ignoring the actual grammar descriptions, and just mining the example sentences to make sure I am covering those tricky parts of the language. It’s a nice feeling to skip over all the boring explanations and the tedious exercises and just extract a handful of useful tidbits from these books.

Ryan