Anything Atlasssian. Jira, Bitbucket, confluence. Just frustrating to use, poor UX, and slow. Business types love them however. AWS. It’s UI is honestly baffling, it feels and looks like someone made it in a rush with jQuery and Bootstrap years ago. It’s login and identity and resource management is confusing, and apparently you need a chrome extension which adds a bunch of complicated options I don’t really understa…
Also agree on AWS. Their UI is so terrible and confusing that it makes writing CloudFormation yaml files feel alright in comparison. Been using GCP lately and the UI is somewhat better though still confusing and weird at times.