That’s where the image above is from.
Almost 60% of US workers who don’t take their allotted vacation say they fear the amount of work they’ll have to return to, according to the survey of 7,331 working Americans. Others (47%) say they stay put because they believe no one else can do their job, or because they want to impress their bosses with their dedication (36%).
I think the not liking the amount of work when you return is probably the most common reason. I know it plays into my thinking when it comes time to take time off.