Without commenting on the use of total war or its applicability, as others have already made good points, I will say that many features of what you describe existed since the beginning, regardless of whether it was the 'policy' of McClellan, Lincoln, or anyone else.
For example, William Marvel notes in his Mr. Lincoln Goes to War that prior to the First Battle of Bull Run, McDowell's troops essentially looted and destroyed Germantown as they marched to Centreville. This was the result of terrible discipline, which is in keeping with the reputation that United States volunteer soldiers had going back to, say, Mexico. Naturally, there were no orders by McDowell to target and damage this area, but it occurred nonetheless.
Another point: I'm currently reading Joseph Harsh's Taken At the Flood, wherein he describes this same area (Fairfax County) during the next summer in 1862. Harsh argues that a major factor in Lee's decision to invade Maryland was that through his success his army had found itself in an area completely ravaged by occupation and stripped of its sustenance. In other words, there could be no return to the state of affairs of the previous winter when Johnston had occupied a broad defensive line around Centreville. Occupation by both Johnston's army and then later federal troops throughout 1862 had stripped the area of food, wood, and other supplies. This was not the result of a hard war policy by either Johnston (though of course he did burn substantial stores when he retreated) or the Union forces (McClellan, as well as Lincoln, pursued a conciliatory strategy during the first year of the war), but the outcome of 'hard war' had been effectively achieved through the simple act of armies occupying that area over the course of a year. In other words, land necessarily became stripped of supplies and resources, regardless of whether armies were attempting to live off the land. The devastation came as an inevitability of war (with particular instances of looting and atrocities naturally arising) rather than policy.
So in a way, I almost see the policy as beside the point. Of course, there were certain Union units, armies, and commanders that were more known for their piratic and lawless actions than others, but I sense a great deal of the suffering inflicted in Virginia during the early war years was inevitable, no matter what the official policy of the commander or government was. As such, it's quite easy to understand Robert E. Lee's desire to take the war out of Virginia in 1862 and 1863, as well as resentment during and after the war by southerners for the destruction of their homes and property. To conclude, I think the practical gap between the hard war practiced by Sherman and others with the soft war policy of McClellan and others early on may not be as wide as we think. It's also just difficult in either case, absent of explicit documentation, to distinguish between intentional, strategic acts of destruction versus cases of poor discipline, negligence, corruption, &c.