There are many, many contexts and scenarios where this exact same sentence can be said in a highly negative way. In this instance it is great, but I can assure you that many Japanese workers experience the dark side of this mindset (e.g., stay in the office as long as possible; don't "shirk duties" by taking time for yourself; god help you if you're a woman; etc.).
I have no doubt this is not everyone's experience, but it's also not uncommon.