Right, but particularly when writing, what "organizing thoughts" often looks like is writing a burst of text (a phrase or several sentences) then possibly editing it / deleting it / whatever. Being able to quickly bash out the bursts I think makes the whole process faster, or at least less annoying.
I switched from QWERTY to Colemak several years ago; I'm not sure I've gotten back up to my previous top typing speed, but it's certainly a lot more comfortable.