The "what it's like" is often bound up with the additional "what would it be like to wake up as", which is a different (and possibly nonsensical) question. Leaving aside consciousness transfer, there's an assumption baked into most consciousness philosophy that all (healthy, normal) humans have an interior point of view, which we refer to as consciousness, or in this paper and review as "phenomenal consciousness". Sometimes people discuss qualia in reference to this. One thing that I've noticed more very recently is the rise of people claiming that they, themselves, do not experience this internal point of view, and that there's nothing that it is like to be them, or, put another way, humans claiming that they are p-zombies, or that everyone is. Not sure what to make of that.