2 years ago before I "Retired" from WoW there was an addon included in Cosmos i believe. that autobuffs whenever you press w. Now I cant find this buff for some reason. Can anyone point me to the right addon which functions almost the same way? thanks

Probably such a thing doesn't exist as auto-anything is auto-mation which is against ToS..

ZomgBuffs is the addon i think you are looking for.