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Yeah... I think I just have to bite this bullet. If you do math professionally and the people you know work onto pen and paper, then that's the answer.
It's just.... I feel like I can imagine a system that would be better than pen and paper. There's so much tedious repetition of symbols when I do algebra on paper, and inevitably while simplifying some big integral I write something wrong, and have to scratch it out, and the whole thing becomes a confusing mess. writing my verbal thoughts down with a keyboard is just as quick and intuitive as a pen and paper. There must be a better way...
Would it make sense to write on a tablet and have the computer do OCR? (Hypothetical system.)