I was just wondering when you disable an actor does it remove him (deletes him) or is it still somehow there adding to my save game size? I must have disabled about twenty Louis' outside Whiterun stables by now!)

I ask because of a mod Ash Pile remover which says it disables and deletes the ashpiles. So I am guessing whatever I disable isn't actually deleted?

"Disable" will make what you used it on invisible, and have collision and AI ignore it. However, it is still there.
if you want something really gone, use "MarkForDelete".

Note: Disable can still be reversed with the Enable command. You can't reverse MarkForDelete, so be carefull when using it.

Thanks for the information. Oh dear, it is actually quite creepy the Letroushs' are still there... I hope markfordelete won't crash my game when he comes back, hehe.