See invisible is very usefull for rogues who want to see them selves in 3rd person view while hidden. Aggro range is reduced while sneaking and sometime you need to see where you are while trying to get to a hard to reach place while hidden and sneaking, so as to make sure you are out of aggro range of a see invis mob. and being able to see yourself is a great asset in this.
Edited, Tue Feb 8 11:13:50 2005