A virtual ground is meant to maintain a potential equivalent to the actual ground in the amplifier circuit (i.e. the "ground potential" is "simulated" by feedback). A non-inverting amplifier has no such node. The node, that I believe you are referring to, [i.e. the inverting input to the amp] follows the input, NOT ground. And the non-inverting input is, typically, connected to a physical ground point (whereas, in an inverting OP-AMP circuit, the inverting input is tied to a virtual ground).
