Or when you look at a photo and think which person is taller - are you thinking in words? Cause I'm imagining cutting and pasting one person next to the other and comparing them visually.
When you try to remember a song melody you probably don't use words to describe the sounds (it was c, g, e, d, ..) you probably imagine the melody in your head, right?
I think most (all?) people use both language and other modes of thinking, just the proportions are person-specific.