Or am I missing something?
In 2.2.2, you have Effects > Add/Remove Plugins. You could strip out all the plugins you didn’t need and only the ones left would show up until you change it.
An early tree structure didn’t work. It tripled my production time because it didn’t have enough controls.
Or you can go to Effects Preferences and in the “Sort or Group” dropdown choose your sorting/grouping method.
But I’ve long used Koz’ technique to reduce the list length for my Audacity production environment.
I have to endure the long list when QA testing