Digital reduces the cost of a photograph.
You are right for sure. I sometimes use my Wife's camera. She has several, successful I might add, online shops so she needs good photos. When I use her camera I think nothing of setting it for continuous (or whatever the name is) and just clicking away. It is almost like a movie at several frames per second... of course you can also take a movie with most modern digital cameras and then pull a picture out of the movie if you want, crazy! I have a smaller pocket digital along with the Zi8. For most of my puropses the Zi8 is fine. Hers is a Canon Rebel EOS T3i, it has the regular lens and I bought her a nice macro lens that cost almost as much as the camera body.
I never studied photography but I do know that with my Mamiya 35mm I would be much more selective if time and circumstance allowed. I have no idea if I got better pictures that way or by just taking a whole bunch of them, I suspect the digital is better just from the sheer number of pictures you can take in a short time with no worry about the cost. More to your question, even though I never studied photography, I (using the 35mm) was certainly aware of film speed, apature, lens speed especially, and which lens I should probably use and I got some great pictures. Always aware of where the sun is with either camera. That said... I think that the Digital SLR gives the user such an edge over having to set everything manually (and think about cost) that it cannot help but give the user better pictures. As for a pro who uses a camera to make a living, I don't know. I would think that they would have and use both digital and film and make great pictures with both.
I have been in a recording studio, not to record but to be shown around (Capricorn, in Macon, GA). It was cool to see where the ABB stood and recorded their albums but I really didn't gain anything other than a great memory. I have been in a professional photography studio a LOT. My dad and my uncle were close. They built homes next to each other. My uncle was the town photographer back in the 40s through the 60s and into the 70s. He did everything, all the weddings, all the portriats, all the school pictures, he was the crime photographer, he was the only photographer and I went in his studio whenever I wanted to. He mostly used large format cameras, even at home on holidays. Then he also had the 35mm cameras. He gave the Mamiya to my dad and my dad passed it on to me... so I have been around a LOT of professional photography and I am absolutely sure that if he were still around he would be using a digital SLR. He would have the others too but loving the art the way he did... he would be using digital and getting both more and better pictures. The art is in the person and a good digital SLR will out perform a 35mm SLR. I think there is something to be said for having a good medium format camera, if you can afford one. I could never justify the expense but I would LOVE to have one.
Good memories... and as Glyn said... after the initial cost of the digital SLR the price of pictures is nothing compared to using a 35mm.
I remember that huge camera from the 50s with a big flash bulb for every picture... but we have good pictures from back then, if black&white... still good and priceless to me. Think, Jimmy in the old Superman shows. That was the kind of camera he mostly used.
Anyway... I think you have it figured out and in a short while your oly question will be, "What took me so long?"... Good luck with digital!!
Julien