As a child, I recall that I very rarely thought in words. This probably explains why I had a tendacy to interpret literally what people say back then and talked at a slower rate than the other students.
Today I think in a combination of words, pictures, 'videos', and numbers depending upon the situation. If I'm designing something, solving a math problem, writing a computer program, or working on a puzzle, it's usually pictures and numbers. If I'm remembering directions, people, grocery lists, where to drive or walk to, usually pictures and 'videos'. Reading, usually images and words. Conversation tends to be a combination of mostly words, but also images for words that I don't know the precise definition of, along with attaching images to people and objects and sometimes 'videos' to situations and events. Sometimes if I'm remembering what a certain sensation or emotion felt like, I will merely recall what it felt like and not always have a word or picture attached to it. When remembering events that occured to me in the past, it is usually remembering my thoughts at the time plus recalling what I experienced with my 5 senses then(and is usually a 'video' type memory or thought, but I often don't get conversations accurate when I hear them from other people. I much more easily remember conversations when I read them). When typing on a forum, mostly images and words.
I'm always thinking and well aware of it and sometimes I wish I could make it stop; I'll often uncontrollably think of a certain topic, which will then distract me from trying to pay attention to something or someone else. during times when it is needed, I sometimes I can't describe my thoughts to others. Most of the time, I can, but I often am told I don't make sense when I do.
For all I know, this could be typical and normal thought processes for most people.