Postoperative problems can occur. Sometimes very low blood pressure, nausea, and pain hold people back from progressing quickly. Problems of this sort can keep a patient from being able to walk around or use the toilet.
Immobility can lead to other problems like blood clots. Dehydration can cause dizziness, weakness, and even falls.
So if you have a good outcome and have good pain control, your chances of going home are very good. Don't be afraid to stay overnight if problems arise. It's great to say, "I was in and out the same day" but not if it means going back to the hospital on an emergency basis after being discharged.