Sounds like that's a benefit in your favor then, in that you can really grind it out when necessary whereas some of your coworkers haven't ever had to push themselves really hard (and thus can't).

Now, in an ideal world, you would never need heroes in an office environment, but I get that shit happens. And there's also been plenty of times in my career when busting my ass was directly tied to faster advancement (and serious monetary rewards), so I definitely don't regret any of the times I really chose to push myself hard to accomplish something.