Delphi is the one the surprised me most. Primarily because I can't remember the last time I even encountered it.
I'm going to guess that's because using Delphi today means "legacy Win32 project I deeply resent maintaining". The general principle of a programmable RAD with a nice IDE and a visual designer is still very popular. I'd wager Delphi would also appear on a list of "most-missed" languages, because using Delphi back then meant a pretty nice developer experience.
Still a pleasant language to use, IMO :)