Tee hee, I didn't expect you to like that stuff. Burzum doesn't at all blow out your eardrums...at least the new stuff doesn't, which is done entirely on keyboard and is basically just some ambient stuff that can either relax you or make you depressed depending on how you take it.
Agalloch and Opeth aren't black metal, however. Agalloch does have some growling vocals, but they're only used half the time and are pretty tame. Most of the music is acoustic, as well. I suggest you try them out, because you may be surprised. As to Opeth, I don't expect you to like the Blackwater Park album (save perhaps the songs Harvest and Patterns in the Ivy), as it is death metal interspersed with clean vocals and acoustic guitars, but the Damnation album is entirely a progressive rock album with no metal elements whatsoever.
Agalloch are seriously, the best band to come out of the US, I really do suggest that you check out ... if any album, The Mantle. It is quite a nice Neo-Folk/Rock/Metal-ish record, quite well suited for wandering the forests on a cold winter morning.
@Sear, Blackwater Park is not death metal, it is Progressive metal with harsh vocals.
A band that I find can be quite melancholy is Novembre.
I don't want to get bogged down in semantics, but...I have to reply. I know most people don't consider them straight-up death metal, and I don't think I'd call Blackwater Park a traditional death metal album, except one or two songs. Personally I'd put that one and Still Life under progressive extreme myself, but other albums like Deliverance, Ghost Reveries and My Arms, Your Hearse are most certainly progressive death.
And to get back on topic, Agalloch really are excellent. I do have to be in the right mood to listen to them, but it's their simplicity that makes them so great. I haven't heard more beauty in a three-ish-chord progression since Pink Floyd wrote Comfortably Numb. Songs like You Were But a Ghost in My Arms are just amazing and really make me appreciate my ability to listen to music.