Hose reels and extension cord reels can truly speed up deployment of your air hose or extension cord.
Extension cords and air hoses can both be a little finicky to coil up on your arm, plus long lengths take a long time to coil. It's much faster, easier, and neater to use a hose reel at the beginning and end of a job.
Alos, since your cord is stored on a reel, you won't be tempted to grab handfuls of your cord and chuck it in the back of your tool trailer.