There are not that many wikis cluttering - most are not sticky so are only there when active
I think that the forum area is overly cluttered with 2 dead fora ( which would seem to be logical to me to move to discontinued programmes ) , 2 announcements and 6 sticky threads
Would be nice to reduce the sticky thread count and relocate the dead fora imo, but the wikis themselves are no more obtrusive than other threads imo