WoltLab does have a nice feature that allows users to easily select which forums they would like to see:
While there are Add-ons like
that do provide somewhat similar features, they only allow to ignore one forum at a time.
If anyone would be interested in paid development work to build such an Add-on (Functionality: Turn On / Off forums on forum index only, no other permissions or settings) please contact me
While there are Add-ons like
[TH] Ignore More
Ignore More Let your users remove content from their view by ignoring forums or threads. Features Add a 'Show ignored content' link when content has been hidden on the news feed and latest activity pages, allowing the ignored content to be...
xenforo.com
Ignore Content
Take control of your experience: ignore forums, threads, tags, conversations, and users with ease. Ignore Forums Allows users to ignore specific forums and hide their content. Ignored forums will not appear in view. Ignore Threads Lets users...
xenforo.com
If anyone would be interested in paid development work to build such an Add-on (Functionality: Turn On / Off forums on forum index only, no other permissions or settings) please contact me