I definitely stand regardless of where I get a seat. Of course everyone stands on the floor, but in the upper deck I found that many people sit. Although now that I have a little more money I try to get floor or lower deck seats.
However, due to my height (5ft 3in) I think I need to be in the first 10 rows or so to see much. Row 5 for Auburn Hills on the Time Machine tour was good, but the section 4/5/6 seat I had for Toledo was somewhat difficult to see from (was on my toes the whole time). I have row 15 floor for Auburn Hills this time and I'm probably going to try for a lower bowl seat for Cleveland tomorrow.