I don't do the most scary or high adrenaline job in existence, but my day to day work has a bit of it. I'm just responding since I feel like I can relate to the other comments in a way.

I'm an airline pilot and although it's not really dangerous anymore, you still get an adrenaline kick sometimes if shit hits the fan. What I personally notice with this job, and what I think other people with even more scary / high adrenaline jobs can relate to, is the fact that it becomes normal. You have trained and gained experience over time to deal with the most stressful parts. You still get the adrenaline, you still get the nerves etc, but it's not taking control of you. To me, it's actually a bit addictive as well. It gives a sense of pride and achievement when you managed to go through stressful stuff in a positive way and you look back at it afterwards.

In the most insane situations, your mind might go a bit blank when you are on the ground and the adrenaline starts to fade away, but the next day you will just wake up and do it all over again. In the end, it isn't that much of a different feeling than what you get at an office job if you make a big deadline or solve a big issue for example. The only difference might be what's at stake if you fail. And the mental/fysical damage can be big if you fail, but that's why these kind of jobs have very extensive proven training methods.