I don't know if I can add or if it will help, I can tell you what happens for me though.
What it takes to get me there has completely changed. Visual stimulus is not only unneeded it is a distraction. It's in the head and touch. First part, the brain portion, is not being distracted and being in the "mood". I don't know if I can explain "mood" as I don't have to be aroused before hand for my boyfriend to get me "in the mood" very quickly. It just seems to be how he goes about it sometimes. Sometimes I don't have to think about anything, just enjoy and it happens. Most of the time I have to think about it when the foreplay is done and the sex is happening. It's kinda like a porno in my head but not. Same but different. It's not images, or not images alone, it's images and physical sensations. I won't say what I think about but I can't really be moving around, I need to focus. Also, I have a tendency to get ah... overloaded maybe, or overestimated to the point where I can't think, can hardly breathe. It's a kinda orgasm and VERY pleasurable, but it's not the IT that can happen. So I have to keep some sense of what's happening and direct him if I can. Touch too long in one area an it fades, hop around too quickly and it fades. Jump to the end too quickly and the he goes over leaving me behind. Which is fine for me to be honest. He still wants to take care of me so he overloads me then holds me till I am done being a wreck. It sounds like work, huh? It's not, it happens or not and there is no stress in it.
The physical part is no where near what it used to be. My skin is very sensitive now. Brushing in varying intensity or tempo, pressure in certain areas is what it takes. For whatever reason my belly is incredibly sensitive. Just no touching the... well you know. I can do that and it only takes smallest touch there when everything is ready.
As for the big O, that has changed too. I can't keep my breath right and I can't keep completely quiet. Then the pressure starts building. Tingling starts in the back of my thighs and stomach and grows to a warmth. My neck gets warm at this point too, from my throat to my ears, not sure why. I have no idea what happens then, or how long it takes. Waves is the only way I can describe it. WOW, then not so hard with the nails or you will make him bleed aga.... OH MY GOD! Then, he smells sooooo goo... WAVE then, what's wrong with you? Don't bite through his earlobe! WAVE Then it slowly goes away. I that point I hope that I don't have anything to do because coming down takes forever.
I have no idea if I am experiencing the same thing other women do. My friends that I have talked to say the same thing basically, "Yeah, I guess. I've never broke it down like that before but it's like that or very close." The conversation usually goes to what we do and do not like after that and I don't push for specifics about the orgasm. I don't think that I will ask any of them again. The last friend that I asked, went on to rate the men she had been with and made sure that I knew at the end that being with more than one guy is not worth it. That she was too busy making things work and being moved around to get anything out of it. There is a limit to how much I want to know.
Hope you get to experience it soon.