The only two times I've touched something remotely tcl was - working on Metal Gear Solid's port from PS1 to PC - it used TCL-like scripting language for the levels, functions were main-like, e.g. "Chara_Init(int argc, const argv[], / something else here */)", and then it was quickly parsing arguments (like tcl) to initialize initial state and types of characters/items/etc.

The second one was through Maya, if you can call maya's language tcl.

It was fascinating to me back then, but nowadays I'm leaning more and more towards static typing.