It's just not as night and day. If you make a simple base salary and that's it, you can plan it pretty well.
But if you work overtime, a second job, receive bonuses, or have some really weird deductions it's difficult to plan ahead on that stuff.
We'll be getting back around $5,000 this year.
But that's largely because my wife received a $20,000 sign on bonus of which she paid about $9,000 in taxes on. We'll get a big chunk of that back.
Plus we had some moving expenses that reduced our taxible income. It just isn't something that you can plan on at the beginning of the year.
Everyone works differently. For many people it's just easier to get a lump $1500 back that they can use to pay down a credit card or put back into their home. If they got an extra $110 a month they would just blow that on stupid stuff like going out to eat or little nick nack crap.