People without aphantasia see images in their head. If you don't see images, you have aphantasia. I don't see images. It took until I was in my 40's to realised that this wasn't most peoples experience.

I agree with you regarding imagination - the problem isn't the usual definitions of imagination, but that the process of seeing images to varying degrees (from fuzzy, brief views to "full fidelity video" they can rewind at will at the other extreme) is so deeply ingrained in most people that a whole lot of our vocabulary uses visual metaphors for the entire process rather than just for the visual aspect.