IRONING large yardages...and before you say anything..YES, I wash all fabrics that come into my house...I am avid about this due to the chemicals that are on the fabric!
having said that, when I have lots of fabric to wash, it means I have lots of yardage to iron...here is how I handle that! OH, I line dry to avoid those deep set in wrinkles the dryer can cause and the thread twisting/knots!
After I wash it, then just fold and set aside..I then take like colors, dampen them and put into a large ziploc bag (one of the super jumbo size) and place in the fridge over night...the threads will swell when wet and release the wrinkles, so I can press much easier!
I learned this from ironing the old military uniforms that were cotton...learned it from my mom who did my dads uniforms for 23 years....