A big part of being a gigging musician, especially a drummer, is traveling with your gear and setting it up/striking it down. In time you kinda get into this routine of knowing where to begin and where to end with the setup/strike-down and where everything goes in the van/car/trailer. Having cases and bags for all the pieces makes the process go a lot smoother and it's much more convenient. Here's a time-lapse video of myself packing up my kit before a gig. Notice how compact everything looks versus when it's set up!
Set-up:
Striked- down:
The life of a drummer xD the difference is insane.