Pen-and-paper is not observable by anybody. It's a complete black box, and there's no way for me to verify that my vote went through.

With a blockchain on the other hand, anybody could verify that their vote went through (just like anybody can verify any Bitcoin/Ethereum transaction). I'd feel much more confident in this than some black box pen and paper because there's zero way to verify anything under a pen-and-paper system.

What disaster of Ethereum? Ethereum is doing pretty well.