Ok. Compared to the plugin you mentioned, this object cache drop-in has a couple of additional features:
1. In case Redis goes away unexpectedly, we “failback” to WordPress’ internal object cache. Most other drop-ins will fatal if Redis is unavailable.
2. Support for Redis native cache groups, should you decide you need the feature.
Also, this object cache drop-in has substantial test coverage, which the other does not.
I want to cache some query results and some computed data that took long to create, in a manner that will keep it across page loads/sessions.. And I want to do it manually. Am I in the wrong place?
Nope, this is exactly the right plugin for you. I just wanted to make sure you weren’t looking for a full page cache plugin, which this is not.