I found two spells so far, in answer to my own question (slow day).
One is a figment and another a glamer, which are not (curiously) mind-affecting. Those seem to be the corner cases as far as I can figure out.
I'm not particularly invested in the outcome one way or another, just curious about how often I have to pay attention to fear affects vis a vis mind-affectingness. Turns out: not that often.
I consider both Haunting Mists and Vision of Hell to be oversights and that all fear effects are mind affecting. I'd say this makes both thematic and logical sense, while also just simplifying things for both DMs and players but YMMV.
This makes sense. But it leaves me torn between my innate slothful desire to keep things as simple as possible and a nigh-Asmodean obsession with loopholes arising from the strictest application of the rules...
...so, pretty much another day with a 'y' in it, really.