Well, I have a relatively inexpensive camera, but I have to say it allows me to take nice shots and learn some things about exposure. I have a measure of control over it that I never had with the most basic point-and-shoot film cameras I had in the past, because my A620 allows me to make some decisions instead of always telling me what to do. I wish I could go on my honeymoon again and take close-up shots of all the flowers I saw in Hawaii; that's how awful my cheapo film camera was. I have great shots of the scenery, but not the beautiful flora that abounds there. The camera just didn't do macro and close-up shots.
If I bought an expensive dSLR, I could take pictures with very little or no light and no tripod, take more shots in rapid succession, and have better image quality at higher ISO. I'd have to spend quite a bit of money, though, buying lenses and CF cards (if I were to stay with Canon, anyway) and batteries and a nice bag. I think I'll do it eventually and my A620 will be the backup camera, but right now I'm happy with the pictures I can take with it.
Oh, and I've never been a huge fan of Ansel Adams myself. His photos never did much for me. But I'm not familiar with the "who's who" of photographers and couldn't give a list of who I do like.