Ironically, we turned on E2EE by default on the develop branches of Riot (the main client) 12 days ago at FOSDEM: https://fosdem.org/2020/schedule/event/matrix/. It will go live across the whole network in the next release, complete with cross-signing for key verification.
And in the last two weeks, two more independent E2E-capable client implementations popped up - one in Dart (https://gitlab.com/famedly/famedlysdk/) and one in Rust (https://github.com/poljar/nio-rust). Video of the Dart/Flutter one in action is pretty cool https://youtu.be/nm36pt2rHcI :)
So yes, we're not as monomaniacal about privacy at any cost as Signal, but we're catching up.