I've have experience with both reading with sound and not reading with sound. When I drop the sound when I read, it stays a stream of concepts, and I can read fast. On the other hand, it also drops pretty much all of the emotional nuances. I don't read much poetry, but I don't think it makes much sense to read it without a voice. I don't think I have tried typing without voicing things out, except maybe when I'm writing code.

I don't read without vocalizing in my head much anymore. I found that without hearing that, my EQ in relation to communicating with a person drops. On the other hand, if I'm visualizing some systems interactions in my head, it's not going to be verbalized. Until maybe, I try to explain it to someone.