Purple Crayon Navigation
"Harold and the Purple Crayon" is a children's book where Harold uses his crayon to draw whatever he needs, and then it's real enough to use.
Sometimes you want to navigate to a class. One way is to go find it in the list of classes or out on disk. If you have a one-keystroke "jump to definition", one way is to just type the class name into the file you're in, and navigate on that. Yes, it may leave an extra word where you were, but it can be a quick way to bounce over to a class you want a peek at.