Switzerland

Continuously exercised and on everything as a matter of course? Not all is done via direct democracy there (even though it is the ultimate backstop in a way), it also has representative democracy.

Switzerland is also a representative democracy

You cannot compare 10 million people with 450 million people when talking about direct democracy. It cannot be done I think. But if you know a way propose it here.

Just saying lets vote directly on everything will put everything on hold until all goes down.

Direct democracy doesn't mean everyone votes on everything.

At the extreme you could do something like localized e-voting: citizens vote on issues that affect a given geographic radius of where they live. Because the boundaries are purely distance-based, gerrymandering is impossible.

Maybe we could have a decaying distance boundary by some measurement like population density or something like it?