I am a dedicated pre-washer of fabric, but I've never pre-washed batting ... and most of the batting I've used is Warm & Natural. My finished quilts have had minimal crinkling, just enough to give it a "real" quilt look but not too much.
Here's a close up of a quilt - all fabric pre-washed, batting not pre-washed. Quilt was laundered after quilting/binding.
This piece did not have heavy quilting on it. The closer the quilting, the more crinkle you will get.