I've used the software that came with my Canon camera "Zoombrowser" since 2008.
Good stuff !
I also have Gimp but usually go with the Zoombrowser for quick n easy and am very familiar with it.
EDIT:\
I am going to check out that video OP posted about using the google software as a stand alone app.
(I deleted it but still have it in my recycle bin)
I do love to try out lots of free software!