Can't answer about copy/paste an NeoVim, but I just switched from vim -> neovim this week, and do feel it's a bit snappier. I also switched from syntastic to ALE for syntax checking and that made a huge difference as well.
For copy/paste in the terminal and vim, I usually have vim in a tmux session, and that has a few helpers to work with system clipboards. Not perfect, but better than vanilla vim's copy/paste.
I was going to mention this same presentation, but you beat me to it. He does a wonderful job with the code, as well and keeping the material interesting, and he has a good sense of humor. I'm looking forward to the videos he's working on for Egghead.io.
Although it does seem to be very slow to respond, https://voat.co/ seemed to have stepped in as a replacement at the last big upheaval. They seem to constantly have troubles staying up though.
They certainly seem to have momentum, despite having trouble handling the traffic. It's a pity that as it stands it's still pretty much a copy though, an alternative to reddit doesn't have to be, and probably shouldn't be, a 1:1 copy.
If you're looking for something different yet similar, I run valME.io which has a very different business model. And because of the business model, it will have significantly less spam and other undesirable content. But the concept it's not for everyone.
