I think it is incoherence that D works as d$ (and C like c$), but Y like yy.And also S is like cc.Are you using Y for copy current line rather than yy?in my vimrc I done maps like this to make it coherent, and S for sth useful:noremap S :w<CR>                                                                 noremap Y y$
Is there a reason that Y is not work in the same manner as D and C?
key bindings