With all due respect, your DM seems a bit... hardcore, let's say.
Yeah, he is an old timer who has been around for every version, and I think sometimes he gets a bit bored or something. He sees his role as DM as part good storytelling, part killing characters.
I am quite different. I place a heavy emphasis on story, and if a character dies and the player and I feel like there is more of that character's story to tell, we will see if there is an in story way/reason for the character to come back to life. Where my first DM was bloodthirsty, I am maybe a bit too lenient.
Back when we just started our campaign back in April, I set up a medium water elemental that all six of the characters were supposed to work together to defeat. The level 2 party was looking for a way to unplug the drains in a deep pool. They saw something moving in the water, so tied a rope around one characters waist and he went in, he was knocked unconscious in one hit, and they pulled him out. Another character had the rope tied around his waist. He stuck his head in the water, tried to talk to the insane water elemental, and got knocked unconscious in one hit. The party decided to take a short rest and re-examine other parts of the dungeon. Playing his character's flaw, the halfling rogue decided to go off on her own and explore the water's edge and see if she could see any way of unplugging the drains. The elemental stepped out of the water and critted the halfling. She died in 1 hit. The cleric ran in, cast divine favor and hit both hits with his war priest ability and rolled high, taking the elemental out and freeing the rogue's corpse.
At this point, I asked the player if he wanted to continue this character or roll up another character. He felt that there was still story to tell with the character, so I had the Tiefling Wizard find that the rogue's trinket (a stone that emitted light with a command word, had writing in Infernal all over it detailing an incantation to bring her back to life. The wizard read it, and she came back to life, not realizing that she had died. The writing faded away, but a tattoo was added to her shoulder blade, marking her as owned by a fiend that they will run into in about half a year from now (1 year from when this happened).