It's not just sad. It's often bullshit.
I don't believe for one second when people say "I worked 120-hour weeks for 6 months!" Simple math tells you this is a farce. Even 100-hour weeks is not sustainable, unless people want to claim they literally did nothing but wake-commute-work-lunch-work-commute-dinner-sleep for weeks on end. Not buying it.
The idea that you're living at the office and actually being productive is just laughable. It is absolutely not helpful except in brief emergency situations.
I didn't have many blocks like that, but those were some of the most productive (and personally fulfilling) times of my life. They made my career. Those allowed me to level up each time in a very significant way.
I also had long breaks after each of those -- they set me up to cruise for a while.
I did that before kids. I couldn't do that after kids. After kids, though, I have a depth of knowledge that makes me applicable for other types of productivity and work.
That mattered less in the days of one artifact software development (and still matters less in areas like video games where that is the case), but software development these days is a process and many projects are far more marathon than sprint.
It should give everybody pause, including software practitioners. A separate, but related pet-peeve is how these unsustainable heroics are often rewarded at work!! Boss: "Look at Chris over there--he stayed up until 4:30AM and fixed that ship-blocking bug. What a champ!" Chris gets a $1,000 spot bonus and now the rest of the team looks up to him as an example of good software development. Incredible but it happens almost everywhere!
When someone says, "Wow, we worked nights and weekends, guzzled Mountain Dew, pulled 48 hour coding shifts, drained our mental health, and half of us got divorced, but the result was this kickass video game!!" it's not admirable--it's sad. That's just not how it's supposed to be done, people!
EDIT: This seemingly well-received comment seems to have ended up perma-locked to the bottom of the page. -weird!-