Qt and it's designer is great until you try to deploy to mobile devices. That aside, I find the non-visual components of delphi/lazarus the easiest to use when doing GUI work for the desktop. You drag a data connection, a datasource, give it a table, some filtering, connect it to a grid and the grid handles all the CRUD operations for you. Even at design time! Hard to find that ease in Qt.

PS: I really love Qt. It lets me do things no other framework can easily do. I love building performant, graphically heavy and fast user interfaces. It just wasn't built for mass-producing desktop forms that are connected to a DB.