Books are not the only source of imagination, for me it contributes to my imagination the least. I don't read, in fact I can't read because my imagination does not allow it, I start thinking of other things and lose focus on the book. I only read textbooks to learn and gather facts from which I can build upon with the imagination. However, I do other creative stuff, I draw, design, and use creative CAD software on a daily basis. I use my imagination by creating. I'd rather be writing a book than reading one, I hate confines of others' imaginations.
But I can agree that imagination let's me have more fun from low graphics games, especially open world.