Stack and Whack is pretty cool. Also cutting triangles with a triangle ruler and then perfectly piecing them. FMQ is a neat technique for quilting freehand. Paper piecing is fun except for all the wasted paper, printer ink and fabric. I will do it to get special blocks like my 1930's Farmer's Wife blocks, and enjoy it. But I wouldn't use it otherwise.
Really intensely dislike machine embroidery, but I love hand embroidery. In fact, I'm getting a little bored with machine techniques altogether and feel the pull towards some hand work... hand quilting and hand embroidery.