One of the reasons I'm flailing around attempting to find a 35mm camera again is because, yes, I've regretted not taking a picture.
I was coming home from Fort Dodge one night in the early fall. Sun was setting behind me as I drove, so it was casting light in this AMAZING way over the cornfield on my left. It looked like the field was covered in gold. I wished for a camera with Velvia then. Heh.
When I had the Nikon FE with the 50mm lens, it went with me everywhere. I very rarely missed a shot I wanted to take. I'm hoping that I get the same results when I start doing it again.