I used to think Jesus was the Prince of Peas.
I would go in my backyard and thought I was discovering news species of insects never before seen by man.
I loved the stars and all manner of space bodies.
The trouble is that I really have not changed very much in terms of my imagination. As a child I had a pretty decent grasp on what was real or currently in existence and what wasn't, but everything seemed to come together more seamlessly and magically than it does now. Everything had its own mythology or symbolic meaning.
That said there are certain impressions and very vivid memories that I look back and wonder if they were reality or something I dreamt. In fact, when I revisited my childhood home recently I drove around and did a fact check of things I thought were real that possibly were not. Most of them were, but I attached significance to them that didn't belong and they were integrated into a larger framework, a different world almost.
That is something I have missed and, thanks to someone special not long ago, I have been able to regain. There is another part to the TE Lawrence quote that is my signature that speaks of men who dream with their eyes open. I put it up because I can relate to it. My imagination is very active and has not, itself really dulled since I was a child.
I can see those ships on fire off the shoulder of Orion. I can create characters with a life story in an alternative timeline and have them quite real to me. I know they are not real, but they are special to me. It's also why I have trouble being an actor.
Playing someone like, say, Roskolnikov would be difficult for me, because Roskolnikov is a pseudo-being in and of himself.
To answer the question more succinctly, my imagination was not chastened so much as it was refined and streamlined. My flashes of insane creativity were like stars in an imaginative constellation or nebula. Part a greater picture I have been filling in and enjoying to this day with some dark periods.