Well I can remember events visually, although not particularly well. I can solve simple math problems in my head purely visually. I can imagine 6 apples, then imagine them cut in half with half discarded and the other halves combined together into 3 full apples. That is thinking about division without using language. I have a much easier time thinking in language than I do visually though. Different people are different though, some people can think better visually than they can verbally. It is kind of hard to differentiate to some extent though, for example somebody thinking in sign language is thinking visually but they are still thinking with language. I guess you really need to precisely define what you mean by thinking and what you mean by language.