I grew up with the long summer break (in Canada), and can't imagine how boring my childhood would have been without it. It was a great time to meet and make friends with the neighborhood kids, build forts, go exploring, go to camp, etc, etc. Some things can't be learned in school.
I'm just trying to make the point that while you have fond childhood memories of long summer vacations, it doesn't necessarily mean that you would be a boring person with boring memories if you went through an education system with longer school days and less vacation time.
You would have different memories and experiences for sure, but neither you nor I can claim to know how you would have turned out were your situation different.