It's important to get right what Marx meant by "the state" or by the proletarian dictatorship, which is fairly well outlined in this article:
http://www.marxisthumanistinitiative...the-state.html
To sum up the main point of the article wrt the dictatorship of the proletariat, Marx saw the worker's state as a kind of council government with revocable delegates. The "state" in the context more has to do with the armed working class protecting the political power of these governments, against the bourgeoisie, while the proletariat works to socialize the means of production. More over, think about M&E say about the Paris Commune. They considered that the first historical example of a proletarian dictatorship, but the characterization of the "nationalization" in Paris was much different from bourgeois nationalization.
Trotsky made a wrong formulation. Rationing, as Marx envisaged it, doesn't require "lines" nor "police" to enforce the "lines." I don't think that was necessarily true back then, but it certainly isn't true now. Labor hours accrued can be placed on a debit system, and delivery of goods can be made as part of the normal supply chain. Trotsky wasn't the most imaginative person and -- I agree with Krupskaya (Lenin's window) here -- he did not have a firm grasp on Marxism or what Marx said, which lead him to insane theories about the "deformed workers state," which many of his followers like CLR James and Raya Dunayevskaya (both who had tight grasps on Marx and, to a lesser extent, Hegel) broke from him with to formulate the idea that the Soviet Union was state-capitalist. Lenin had a firmer grasp on Marx, as opposed to Trotsky, but he still made some fairly fundamental errors and covered them up as "necessary" because of Russia's backwardness.