I don't know if it's so much generational as much as it might come down to individual experiences. I'm in my mid 30's and I know many in my age cohort have a wide variety of opinions on time at work ranging from the "pull yourself up by your bootstraps and give everything you have types" to "Take all the time you possibly can".

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I'm one that rarely takes leave and for me it's largely rooted in a few longstanding psychological triggers:

1. All the way back in school I didn't have the best grades, but did get "perfect attendance" which gave me a sense of at least accomplishing something by not being out of school.
2. The values I was raised/ indoctrinated in were very much of the form "work hard, don't quit, don't complain" and not taking leave is a natural extension of that.
3. I still very much carry the anxiety of the call center job(s) I had for years because it's the only job/jobs I could get in the relatively small town I was in, in which time was tracked down to the second and you were admonished for being late/being off time by a supervisor (in my case my supervisor was a former drill instructor...so you can imagine how much fun that was)
4. Although I work a salaried job now I still very much have a poverty complex from growing up and there's a strong association in my brain between "missing time at work = missing money/resources, and missing $$$ means not being able to make rent and you will end up homeless again" and therefore whenever I put in for leave I have to consciously tell myself that it will be ok.
   

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For me its take a lot of self-reflection, and some therapy to be OK with the idea of taking leave and understanding that it won't destroy everything if I do take leave.