I love writing, not more that illustration, but for different reasons.
I write non-fiction, and I find that it is such a great challenge to explain something complicated using as few words as possible. It is important that I use the appropriate number of words on a page for my reader's age level. I don't want the reader to get bored or confused, and I need to use words which are familiar. If I am introducing a new word, I must make sure it can be learned on that page, either in the context of the other words, or revealed in the illustration. But along with this, I want to use language that is not only clear, but sounds beautiful.
It's fun to write picture books, because you know that the pictures will add to the meaning of your words.