I want to search for Ubuntu's go-compiler package.
But if I search for "go-compiler" (with or without quotes) I get a bunch of hits for "Go compiler", with my dash turned into a space. That's a bunch of hits I don't want, and now I have to go wading. None of the top 10 hits are about what I asked for.
To me, the + operator meant "I know what I'm doing and please turn off the fuzzy help".