So I've returned to KSP modding after quite some time and as it turns out CKAN got more cluttered than ever.
Wrote a small very hacky kerbal plugin to declutter my mod list and thought maybe someone else got the same problem and could make use of it.
Usage
Just download the dll somewhere, add it as CKAN plugin and you'll be able to hide mods from all filters by right clicking them and chosing hide.
There's also a new filter in the filter list that will list all hidden mods.
Download
Source
Enjoy your clutter free CKAN list