@existential potential,
From my own understanding of the subject - Language are 'words' and 'structures' that are associated with concepts / pictures / memories in our mind. This is the reason we sometimes struggle for words - because there may not be a word or phrase to express the concept in our mind. The simple fact that there is a concept in our mind which doesn't automatically equate to language shows that consciousness is not about language. This also shows that it is the 'concept' that forms first in the conscious brain, before the language is (usually) subconsciously applied to express the concept.
Many who study the subconscious think that you should use pictures rather than language to tell you mind what you want to achieve. For them, the clearer and more life like the 'picture' or 'movie' the more effective it is. On the other hand, I think that both 'envisioning' and 'language' is effective, because of the normally 'automatic' association between language and concept/memory/pictures.
Showing futher that language is not the foundation of conscious - the same word, which may have a very specific definition, can still have situational meaning in our mind, and can still call up different emotions in differing circumstances. The meanings of words can also change over time for us. This shows that 'language' isn't the definition, but rather, the association each word or phrase or structure has within our mind...to the specific time, understanding, emotion, and circumstance.
Thinking in 'words' is also quite cumbersome, and in emergencies, we can 'think' in a split second, so many 'thoughts' that it may take us hours to put those thoughts into words - to sort out what we actually did think. I like to call these thoughts 'semi-conscious thoughts' - because we think them so rapidly that we aren't truly aware of the
process that goes on...but afterwards we can remember it, and put it into words. (So for me, there is the concscious, the semi-conscious, and the sub-conscious)
Envisioning is a conscious process, and it need not involve any language at all.