My main reason for plopping is to speed up the drying time from several hours to a few hours.
I take my smooth, stretchy tshirt, place it on the bed upside down (collar at the bottom), bend over and as I get close to the shirt, I gently pull it together in one clump and make sure it's right in the center of my crown area. Then while I'm still bent over and head into the tshirt, I take a sleeve in each hand and bring them around to the back to meet, transfer them to one hand, then with the other hand I grab the long part of the shirt and bring it underneath the sleeves and tie the sleeves together over it.
Sounds complicated but it's not. It's just the way I explain things.