Making real, complex components, and drag dropping them into other components. Designing a UI with all your components and zero layout code, just positioning them visually. To anyone who grew up with VB6, web development feels like a serious regression.

I will probably die on this hill with you. Let me please complete a few bucket list items first though.

For the life of me I cannot figure out why we do not have a successful Windows Forms-like toolkit for the web that took off.