Trusted plugins from a WordPress Support Technician.
I have been in WordPress Customer Support Technician for 9+ years. I've worked at companies like WebDevStudios and Maintainn. WPEngine has a great list of Disallowed plugins they use w/ a description why.
These plugins I have used/seen used on over 50+ WP websites. They also power my own website russellenvy.
It's usually because they have their own caching solution. Or it is in the case of WPEngine.