I had the good fortune of being spoiled about what happened to Donna before I watched Journey's End, so thankfully it didn't hit me as hard as it would have otherwise. But yeah, it still sometimes hurts to realize that Donna's never coming back permanently. She just...really didn't get enough, IMO. She deserved another season, she deserved to live up to her full potential in a non-DoctorDonna context, or at least get a better ending, some kind of closure. :(