As an American currently working remotely while traveling in Europe I have seen some of this first hand. I think there's pros and cons to the aspects I've observed.
- Probably the most obvious is meals. In most European countries its not uncommon to take a 2-hour lunch break and to take 2-3 hours for dinner. But at the same time, the quality of food is higher, meals tend to be larger social affairs (not something you do alone), and slower more relaxed meals probably aid digestion. This contrasts sharply to the obsession with fast food/quick service meals in the US that are mostly taken alone and on the run. In some cases it was frustratingly difficult for me to find a restaurant with quick enough service that I wasn't feeling like I was letting my own team in the US down.
- Transportation is less car-centric. What this means though is that a lot of people have a longer, if somewhat more relaxed commute. For instance, rather than a 15-20 minute drive if you live "near work", you might have a 10 minute walk + 40 minute train/metro ride. Sure, you /could/ be working on the metro in theory, or checking emails on your phone while walking. But people don't, and in a way that's great. It gives you a few moments of wakefulness where you don't have to focus and you don't have to think about work.
- Holidays. I'm not really sure how this works out in small and broad technical teams like Operations. But it seems like given the amount of holiday time Europeans are granted and take that there's probably someone out on holidays on your team at any given moment. On the other hand, I imagine that there are less stress-related deaths in Europe.
These are all just my first-hand observations, I haven't really dug into the stats around it, but I can imagine how these and other factors could easily lead to an overall reduction in work hours or even productivity vs American workers. On the other hand, I've found Europeans tend to be healthier and happier than Americans, so maybe it's not such a big deal?