On one hand, a door is a door and both lead you inside which, I think we can agree, is the ultimate goal. However, the front door is the front door for a reason and intended for heavy travel. The back door is more of an option B. Some may even call it an escape route.
But(t) on the other hand, going in the back entrance is a different experience. You can see things from a new perspective - new sights, sounds, etc. Mix it up a little. Take the road less traveled.
There are a lot of reasons one might be required to use the maintenance entrance, though. Perhaps the front door is under construction. Maybe Aunt Flo is visiting and leaving her mess all over the place. (Nobody likes that heifer.) Or maybe you don't give two shits and you plow through her mess. Who am I to judge.