When you bond with coworkers, they seriously become like family to you. They will care about you on your good days, be there for you on your bad days.
They will get the kind of day you are having because they will be right there with you, especially on days where you are busy.
During the holidays they will feel your pain of working long hours, because they will be working long hours as well, some of us live paycheck to paycheck, and some of us barely struggle to get by.
I am thankful for my coworkers I have, because they are nice and funny, there is never a dull moment where I work at because even while we are working we manage to have fun. We know when to joke, and when to be serious.
I love most of the customers that we have at our store as well because so many of them are super friendly and interesting to talk to. We have a lot of regular people who come in weekly for grocery shopping and you learn who they are as the weeks go on.
Your coworkers become important to you because you learn to work together as a team, and form a close family out of it.
You have each others backs(though there are those who bad mouth each other) and you look out for one another.