Yes, I have become a convert to staching my quilt blocks as I go along. I use Diane Gaudynski's home made corn starch recipe given on her website. Check out her monthly Tips as they are great!
To avoid starch build up on my iron, I generally spray the pieces and then let the starch have a minute to soak in the fabric before I start to press. AND I found out that spraying from the back of the block works for me. I press the seams as they were sewn first then turn the block over to finish, laying the seam in my preferred direction. When sewing blocks to sashings or borders, I wait to starch the strip after it is pieced to the block.
Eventually, there will be a bit of starch on the iron and I just take a vinegar soaked washcloth and scrub off the stuff when the iron is cooled.
I really would love to have DG profiled on a TQS show! Her quilts are amazing.