I remember being frightened, but I don't think I was ever as afraid as I should have been.
Started fighting and covering wild fires in about 1973, first on casual crews out of the Forest Service station at Jerseydale, then for whoever would pay me to go watch and report back. So, mostly then it was humungous campaign fires, the ones that totally blew out to burn down subdivisions and this and that thousand acres of timber. Fires you could see from ten miles away when bowls of fire popped out of a ridge. Not the scary part.
If you've been smoked by a campfire or fireplace sometime and done that hold-your-breath-and-dodge thing, that's the scary part, only on a wild fire there's no place to dodge. The smoke suddenly blinds you and worst case there's no information about which way to run. And it's always steep, so not so much run as scramble. And you can't see. Or breathe. Kind of a dry waterboarding I'd guess. Pretty bad. I never walk past a hillside of Bear Clover, as my suffering family knows, without thinking what a freaking misery it is in a fire. Just a ten-inch-tall little plant, hardly worth looking at, that produces in fire a godawful dense oily smoke. Makes my throat catch to remember it at all.