I've been using Midjourney [1] (it's not free, 25 photos demo, then 10$ for ~200 photos or 30$ for unlimited I think?). It's fairly fast, ~20s for a grid of 4, then as much for upscaling. I like the controls, it lets you do variations and tweak the image as you go.
It's not as good for doing concrete asks, but it's very good for getting specific vibes.
The website feed [1] requires Discord login to view examples, but there's some unofficial galleries [2]
[0] https://www.midjourney.com/