I don't tie mine one handed ,but close to it. I do not form the loop the way it is shown to do in most pics.
I start by throwing the rope around the pc,usually right to left,grab and pull back to me with the left hand,grab the end with the right hand again pulling extra line tru the left hand,then with the line coming out thru the top of the right hand I go under the main part of the line then back to the point where it will be tied,make an X over the line forward of the left hand,grab the bottom where I just Xed over with my thumb,and with one motion twist both lines with the right hand.This leaves me with the hole and the rabbit's first trip thru.Then wip the tail under and around,then push it back thru the hole with the left hand.
Sound complicated eh?
Probably why I have a hard time teaching it to others,but like you said,it is in my muscle memory.
Once I have it around the branch and have the line back in my right hand it literally takes me one second with my eyes closed.
Note: The only problem with a bowline is it must STAY SET until loaded.
It's greatest asset is also it's greatest liabilty.IE ''It un-ties very easily once unloaded"
Sometimes the it can wobble loose before being loaded,usually when the limb is a good distance
from you and requires pulling a lot of line to choke it,more so with larger stiffer line.
In those cases ,I like to have a longer tail,and take a little more time dressing and setting.
Just my .02 worth.