I don't hate sundays because the next day is monday, I hate sundays because nothing happens. Nothing is open, except food establishments, and I work at one. ON SUNDAYS. and you know what happens on sundays at food establishments? Church rush.
I hate sundays not just because of the church rush, but simply because I cannot get anything productive done, even if I wanted to. I can't call my doctor, I can't call most businesses, I can't send mail, I can send email but no-one answers it anyway till monday, I can't get mail, I can't get packages, I can't go to most art museums, most people don't even want you to call them on sundays. Sundays are the doldrums of the week, sunday you are forced to be inactive unless you have to serve a church rush, and it's not even the productive kind of active, it's just a rush of ignorant people that wont tip waiters and order too much food.
And it's even worse when you're non-religious, sundays literally have no meaning for you, they are just a day that no-one wants to work and it is difficult or impossible to get meaningful work done. Any day of the week you could take off, but religion mandates it be only one day and everyone does it THAT day.
Sundays build up to be more inconvenient for me than black friday every year.
Mondays though, mondays I cherish, because I can actually get things done on that day. I love mondays!