Adobe (and the assimilated Macromedia) are the state of the art at UI for designers (Photoshop; Flash authoring tools). While they can include interactivity for many standard widgets (much as Word includes code for many standard typographical symbols), they can't customize the interactivity within the tool. It still needs developers, who must work with the generated code...

OTOH, there's an argument that standard interaction is a good thing, so maybe a lack of customization/abstraction isn't so bad?