Great post and question!
For me the terms Blow Job and Cock Worship are not the same even though they - sometimes - use the same physical actions.
In my vanilla days a Blow Job was something that was given, or I asked for, whereas redefining the activity as 'Cock Worship' brings it under my control. I decide when I will have Cock Worship, where, how I will have Cock Worship. It is reframed as a gift from me to my partner, she has earned it, she deserves it or, more often, I just want it. The activity for me is about power and reinforcing the dynamic rather than for simple gratification, it can sometimes lead to sex or to ejaculation but more often than not, does not. It is ritualistic and helps us both find our places. I find the power exchange is often deepened in this activity by talking to my partner, sometimes with instructions or praise (like the case outline by @tallslenderguy), sometimes degradation or humiliation, sometimes talking about other ways she needs to focus on pleasing me. I find this very effective and I see great parallels with hypnosis in terms of accessing the subconscious when someone is in a flow state. None of these things could or would be part of a 'Blow Job', at least for me.
For my dynamics the term 'Worship' is certainly useful, i.e. having those religious overtones. I can see for others that they might be more of an obstacle. I'd say the entire 'Cock Worship' scene or mini scene includes the oral pleasure but also contains many other aspects: the taking control of the moment, the dialogue and shift of energy that gets us to the space required, instructions that lead to the worship, often times the talking through the worship, how I use my hands etc, and then the ending process. Interestingly, it took me a while to figure out how to end the worship if I decide not to ejaculate, but it is not too difficult to come up with a set of methods.
A couple of final points: For me, I have not had a Blow Job in perhaps 5 years, since I reframed the activity as Cock Worship in my own head. Also, the reframing of Blow Job to Cock Worship allows me to make it a training exercise or something very specific to our dynamic. For example, most new partners I meet know how to give a Blow Job in the generic sense. I can though, underline the fact that all that is well and good, I need them to learn how to Worship me in a very specific sense, tailored to my needs (and the talking training comes in here again!). It is easier to do it that way rather than reprogramming something that is already termed a Blow Job.
Thank you for the question, its been interesting to write out my thoughts