I'm a developer on one of these projects (Nano). I normally refrain from posting about it on Hacker News, since it's almost never actually on-topic, but if there are any questions I am happy to answer them.
I had that feeling again when I first used Nano. A friend of mine and me, we got the wallets and kept sending Nanos back and forth, just because. 2s per transaction, no fees. It blew our minds.
Not to shill Nano. It might well be the case that Nano won't be occupying this space of near-instant and feeless transactions. But _something_ definitely will, and it will happen rather soon.
LINE Pay (a local service trying to recreate the success of WeChat Pay) used that as an ad campaign. "Just flick 10 cents back and forth between your friend to see how quick and seamless the service is" [and get free stuff because of course it's an ad campaign] https://www.youtube.com/watch?v=OwDM0oKCgbE