Seems to be rather widespread:
Woulda-Coulda-Shoulda
By Shel Silverstein
All the Woulda-Coulda-Shouldas
Layin' in the sun,
Talkin' 'bout the things
They woulda coulda shoulda done...
But those Woulda-Coulda-Shouldas
All ran away and hid
From one little Did.
The more interesting (side) issue to have arisen, I think, concerns an editor's influence on matters of style. I'd have to say that if my editor (in the real world) staked out a position like David's did in Kaos, I'd move on in a hurry. I believe, and need, reasonable editorial oversight, and I want them to be thoroughly anal with their concerns, but my "voice" belongs to me and I won't be a bottom to their issues over that.