The European laws are not some random thing we made up because we are lazy. It is to ensure workers are well rested and ready for a new working year. Hence in long term it will also benefit employers.
Some personal anecdata: I notice an immediate difference when I come back after a long vacation. The first 2-3 months I work at top efficiency, get probably done twice as much as I would do any other month.
Maybe is not as bad as you think?
https://en.wikipedia.org/wiki/List_of_largest_companies_by_r...
The thread you're commenting in is about whether workers can still do good things even if they get breaks, not whether they're currently a member state.
A cursory googling says that Swiss workers get 4 weeks and UK workers get 5.6.