There are a number of volleyball exercises where players start off blind to the ball, then have to find it. Here are my thoughts on their value.
Responding to a reader question, here are thoughts on the difference in approaching the coaching of strategy and tactics to varsity vs. junior varsity teams
Volleyball butterfly drills are used by coaches all over the place. I'm not personally a big fan of them for a couple of reasons.
Here's a scenario a coach presented where you need to come up with a way to do setter training on a half court with some constraints.
Remember that player reactions start with properly reading the visual cues, so it makes the most sense to include those cues in training, not remove them.
You can use process scoring rather than more standard outcome based scoring to continue your development work in training games.
While making detailed long-term coaching plans for a season is impractical, it definitely makes sense to have things you're working toward developmentally.
As a covering coach I ran three shortish practice sessions for a group of 15-and-under girls. Here are the plans I used for those three sessions.