setting seams

I made this bee block for Bonnie yesterday and all the while I was thinking, 'boy, i sure could benefit from a precision piecing class.' Those little red blocks finish at 1" square! The block is 9.5" total. That leaves very little room for error. I love piecing tiny things, but I definitely have room for improvement in the accuracy department.

Just as I was finishing up this block, I recalled reading/hearing about setting seams. (There is a short video here that explains it well.) I was somewhat skeptical, having tried it in the past and didn't notice a big difference. I decided to give it another try yesterday (what did I have to lose?) and you know what? I really do think it helps. I just might be a convert.

So now I'm curious...do you set your seams? Do you think it helps? I'd love to hear your thoughts.