I wouldn't dare say I have any kind of work flow since I'm very disorganized and currently keep stacks of negative sleeves in boxes. I do date them and write the location on them, go me!
I can certainly relate to going back to places where I found good pictures, in my case in the same city for the most part. I will go through bouts of going back several times in the span of two or three weeks until I feel like I need a change of scenery. I find this to be a great exercise for sharpening observation skills and experiencing surprise
It keeps me curious, excited and light-hearted. Using just one camera and lens also helps me stay focused on observing.
As for reviewing negatives, I also find "new" ones when looking back. I think that distance from when the shooting happens really helps me see the photos more abstractly, if that makes any sense, and I get to appreciate them differently. Another cool aspect of this is that, as I try new things artistically, I can use pictures in a different way. For example, I'm now going through a period of intense collage making, and I get to play with them in a different way. It's a gift that keeps on giving!