We have struggled with testing in the past.
We used selenium, which is crazy powerful, but also pretty hard to use.

Along comes UIlicious, which does exactly what we need; which is to verify users can follow specified paths on a tool and do "things".
This is so incredibly simple to do with UIlicious that I wrote a test to login, browse to a specific page, create a test thing, check that the test thing was created and finally delete that test thing. It took me about 20 minutes.

And I think it has other uses as well; it can be triggered in a build pipeline, so it should be usable for testing staging, before automatically pushing to production if the test succeeds. That is next to figure out.

Another use case could be simply automating certain things that need to be clicked; like tools that you don't have api access to but can login. I'm thinking of resetting a stuck VPS for instance, that does not respond to ssh.

I still have to figure out what else we can do with it, but it looks super useful if you need to test [insert thing here] using a web interface.