I haven't been to that Quiznos, but would think that might be another good option for something fairly quick.
There's a Carls Jr. (not my thing, but others like it) not too far away on Harbor Blvd. If I recall correctly, the Del Taco on Katella might be more of a walk than it's worth. There are also several choices near Harbor & Chapman (Joe's Crab Shack, Red Robin, etc.); I walk it, but not sure I'd recommend it for everyone (it's a hefty distance if you're short on time/not comfortable walking around at night).
The IHOP across from the Park is higher priced than most of their other locations (at least it was that way a few years ago).
In my opinion, Mimi's - as as chain - isn't as good as it once was, but it's still one of my top picks in the area.
The choices in that area are definitely better than they were several years ago; I don't even bother eating in the Parks anymore.