If Evil mode or Spacemacs worked perfectly I'd have switched a long time ago. But based on my experience with it I'd say it would take me months of practice and configuration just to get the same experience. And for what? Just so I can do the same things in just one program instead of two(Vim + terminal)? Not worth it for me.
Besides, as long as hitting the Escape key feels like sending messages in morse code I don't think I'll ever get used to it.