Sublime is a very cool editor, but since you can't debug in it, I guess it's only useful for web developers.
For one, web developers debug too. Javascript, PHP, Ruby, whatever.
Second, you can very much debug in Sublime (whatever that means). Do you mean something like an integrated debugger, like say XCode/VS have?
A lot of developers use external tools for that, like gdb et al, depending on the language.
Tons of developers of any kind use sublime, from C to Go.