RE: So... who listens to death/black/trash/viking/etc. metal
I love melodic death, and Progressive metal for the most part. However Bloodbath is a wonderful metal group that's rather out of my spectrum.
But a great group that you might like is Instant Suppression if you enjoy a little technicality and clean vocals as well as screaming (and a female vocalist). Also you probably have heard of Between the Buried and Me, If you haven't they're definitely a good band to look into as well. If you do listen to them, their album Colors is a good start,(their first two aren't to fantastic). Finally, I'm sure you've heard of Meshuggah too, but god forbid you haven't look them up ASAP.