Man, I was so stuck last week on a chapter. Like, staring at a blinking cursor for two days stuck. On a whim, I pulled up one of those generators, hit the button a few times, and got 'a gardener who finds a key that unlocks memories in plants, but it works on people too.' It sounded silly at first, but then I started wondering about what kind of gardener, what memories, and who'd want to steal that key. Next thing I knew, I had a whole new side character and a subplot that actually tied into my main theme of forgotten history. It didn't solve my exact scene problem, but it got me thinking sideways instead of head-on, and that mental shift was everything.
I wouldn't use it for the core of a story, but as a lubricant for a frozen brain? It's shockingly effective. The prompts are often just weird enough to bypass your internal critic. You're not judging your own precious idea; you're just playing with a random toy the internet gave you. That low-stakes experimentation can lead you back to your own work with fresh eyes.