Docker isn't just for orchestration. I've used it in a very small company and even use it for personal project just because it provides me with an easy to set up and portable development environment.
Docker can also be useful to create reproducible deployments, especially for languages like python when your dependencies may change between `pip install`s
Having said that, I agree 100% that for most small/medium sized companies kubernetes is an overkill which creates more problems than it solved.
The problem with AWS etc is that you need external servers (i.e. no good if it needs to run on the local intranet). Also the cost of adding even a new VPS is much higher than spinning up another docker instance.
I'm pretty sure a lot of companies use docker simply to ease deployment of internal apps.