Smalltalk is a stealth weapon in the banking industry. I know Wells Fargo has a codebase based on it. I know this because roundabout 2008 I was pestered by recruiters looking for Smalltalk devs willing to move to cold, cold Minnesota. (Boston winters are more than enough for me so I bade them a courteous no-thank-you.)

Also, most of the currently trending methodology buzzwords (Extreme Programming, TDD, refactoring, etc.) emerged out of a community of Smalltalk programmers on real professional software projects.

What Smalltalk lacks is marketing hype.