For example, on a normal camera, 105mm gives you more bokeh than 50mm, but you get a tighter image and a smaller field of view. Medium format makes the 105mm field of view roughly equivalent to 50mm, but still gives you 105mm-bokeh. This is extremely useful for me because its not how much bokeh there is, its how far away and big my subjects are while still being able to blur out the background slightly.
It's the same thing as saying "35mm gets less DOF than 1.6", except on a larger scale.
This is what 105mm looks like on a 35mm camera, or full frame sensor.
This is what 105mm looks like on medium format (6x7)
I brought these two images to the same size on your screen to show you what the final difference looks like (posting on the internet at 500px wide). If you took those same images and posted them at their original resolutions, the medium format would be significantly larger. You can look at H4Z3Y's post to see the difference. I also have this: