I am writing scheduling software for an uncommon use case.

The best method I have found is to use the interface and fix the parts that annoy me. After decades of games and internet I think we all know what good interfaces feel like. Smooth and seamless to get a particular job done. If it doesn't feel good to use it is going to cause problems with users.

Thats said. I see the software they use on the sales side. People will learn complexity if they have to.