Even after not using it for 10 years I miss Delphi a lot. You could click a UI together in a very short time, add some code and you had a running standalone .exe without the need of any runtime dlls. Yes, Delphi it was limited in some ways and the language was not the best, but is was (and in my opinion still is) the best way to easily create a "simple" standalone gui applications.
I remember Delphi and its Microsoft counterpart Visual Basic 1-6. They were the best RAD tools to develop GUI applications. Frontpage/Dreamweaver/GoLive were RAD tools for HTML3-4 and very good too.
I currently miss the rapid development tools we had 15 years ago. There is definitely a need for a HTML5 RAD tool - ideally with the combined functionality of JetBrains WebStorm and Adobes Dreamweaver.
I'd be interested in how that'd be better, today, than C#/WinForms (WPF is nice, but not for quick things). I only used Delphi a little, but C# and WinForms are super nice for clicky things and I don't think you'll find a machine in any sort of common use without at least .NET 2.0 on it, being at least effectively standalone.