Haha, yes, my grammar has also gone to hell these days. (BTW, is syntax separate from grammar? I forget from my linguistics classes.) I actually blame chatting. Also Japanese study, which has messed with my brain. >_<
I dunno, the furthest I got in formal language instruction was tenth grade English. No, wait! It was fourth-semester French. (It's odd to hear you say that Japanese has weakened your grammar, when foreign-language study is the way most of the people I know learned the few rules we do know. But I guess Japanese is just Special like that.) If I could re-do college, I would definitely find the time for an intro-level linguistics course and at least one intro-level macroeconomics course.
I mean, it has improved my knowledge of grammatical terms, but knowing theory is different from practice. What I mean is that my reading lots of Japanese text (well, not lots by the standards of English text reading; by those standards I've read hardly anything, and also it's not really study because all I've been doing is reading, not trying to memorize vocab and half skipping over things I cannot parse grammatically) has made my brain half swim recently.
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