This is good advice. You can get burned out anything, even the thing you love most, if you're doing that thing exclusively. The answer is definitely, as you suggest, to vary your experiences.

Also, and I'm just speaking for myself here, these huge open-world games that demand 100+ hours are a lot to deal with. They can be amazing, but if you play enough of them, they can start to feel like work. Sometimes, a solid 15-hour campaign is perfect. I'm playing FO4 now, but I think I'll take a break from big open-world games for a while after that.