So I came to Korea through EPIK in Spring 2018 and based on what they taught us about lessons in orientation, it does train you to rely on games/activities. One of the first lectures on lesson planning the lecturer just whipped out a folder full of ppt games and shared it with everyone. We even played 3 of the games during the lecture. Our lesson demos at the end of orientation were so activity heavy it was ridiculous. And the feedback wasn't focused on the content of your group's lesson, just how you worked together as coteachers.

On top of that, what training we get on how to actually teach here is so minimal and subjective that it doesn't really help. Every lecturer was either a Korean teacher that went to school specifically for teaching English or an NET from a huge school in a big city. That doesn't reflect the experience of even half of NETs here. I don't think it's a stretch to say most people in EPIK/GEPIK teach in small schools in small cities or even rural areas. Yet the examples we're shown are NETs in Seoul or Busan who have high level students that participate in reading clubs or write English journals. It's really unrealistic and puts this false expectation in your head. Small schools and low English levels are like a side-note.

Elementary is big on games.  KT do a part of the book for part of the period.  Sometimes, they will hand over part of the book to you and you can do the book game or bring your own.  I usually bring my own.  Teacher may want me to come with an activity that is speaking based or more focused on writing but still a game.  Often a group game but sometimes a singular game.  I uploaded a sampling of what I did last year. 

Middle School you have more control and don't have to do as many games, though I still did some classes.  Sometimes, I did give handouts with writing but not too often because the kids would complain (and we all know little emperor syndrome here and in many other countries).  But there is less co-teaching there as opposed to elementary.  It is more on you.  You can have higher level kids who speak English well, but you can also have more kids who don't want to listen in class and sleep or talk and disrupt.  (Pros and cons.)

I think PP games are great for review. I use them 2 or 3 times a month to do just that. Each one has questions covering everything we've been learning. I teach at an international school: math, English, science and geography. I find them a useful tool but that's what they are, tools, not necessities.