"Personally, I only like to trigger the bass drums, as I love a good natural drum sound. I don’t care if it’s the best trigger unit in the world, nothing is going to sound as good as a drum that is perfectly tuned. The thing with the bass drums is that 1) it’s very difficult to get two bass drums to sound exactly the same, and 2) most times, double bass at higher tempos sounds like ass through a PA unless it’s triggered. To get a good consistent sound for double bass without triggers you need good soundgear (speakers, compressors, gates, etc.) and an excellent soundman, and even then, as the show progresses, the drummer will start getting tired, and while he may continue to play perfectly, the power of the strokes on the faster parts won’t be as strong as they were at the begining of the show, and there’s not much a soundman can do about that, because if he tries to raise the parameters for the kickdrum sound on the faster bits, as soon as the drummer comes back to a part with a slower tempo, the kick drums will be too loud because now the drummer will be playing with his natural power. With the triggers, it’s as easy as getting them to sound good, and that’s that. Consistent sound all night long."
http://www.globaldomination.se/interviews/tony-lauerano - Interview with Tony Laureano, ex-Nile, session/live Dimmu Borgir.
Yes, I'm aware of death metal other than Nile/Necrophagist/Death. If you'd like me to name some that I listen to (not strictly death either, so if you're going to say "zomgz that band is melodic death LOLZ", get the sand out of your vagina.):
Cannibal Corpse
Morbid Angel
Arch Enemy
Dark Tranquillity
In Flames
Bloodbath
Atheist
Cynic
Quo Vadis
Cryptopsy
Dissection
Hate Eternal
Hypocrisy
The Berzerker
Torture Killer
Vader
Akercocke
Suffocation
Incantation
Edge of Sanity
Deicide
At the Gates
Is that a good enough list for you, oh great savior of all metal knowledge?