For black and white I find the where LF excels isn't resolution, it's tonality. Leaving aside all the perspective controls, which are useful once you understand them, LF is a completely different way of photographing something. It is by necessity much slower, and I find much more contemplative.
I have spent half an hour looking at a scene, walking around and visualizing how a print would look, and in the end decided to not bother setting up the camera. It wasn't time wasted, but it was still productive in the sense that I was forced to consider what I really wanted my print to look like. With 35mm or MF I probably would have taken a few shots and then never printed them.
As an experiment one time I took a photo of a small creek in the mountains. I used a slow shutter speed to blur the water and shot it with 35mm using Delta 100, and 4x5. I printed then both to 11x14, and made them as close to each other as I could. Then I took them to work and asked my co-workers which print they preferred. Every single one picked the print from the 4x5 negative, as it had much better tonality. For lack of a better word, it had more greys than they 35mm print. Resolution and detail was good enough on each, but the smaller format couldn't compare to the smooth gradation between the greys.