I've lived through the best years of the "Socialist Camp" myself, although not in the SU itself, so I know how it was first-hand.
Therein lies the issue. I don't doubt your experience was between really bad and horrible, but you're doing a different comparison than the one I'm doing.
Your perspective is contrasting a) the Socialist system you lived through versus how b) democratic societies of the time were. This is a fair comparison, and it's undoubtful the first was, in comparison to the later, bad. Really, really bad.
What I'm arguing is different though. I'm doing a comparison between what your reality was (or, more precisely, what the URSS reality was) versus c) what it would have been had Tzarism continued, by extrapolating from the later based on how other feudal societies historically developed over similar timespans.
A third possible comparison is between what Russia became versus d) what it would have become had it gone through a Liberal revolution in 1917, rather than a Communist one, that is, a revolution that had embraced Classic Liberalism in economy, Representative Liberal Democracy in politics complete with multiple political parties, full freedom of the press, full free speech rights, full human rights with a comprehensive bill of rights, limits on central power with a fully enforced Constitution government branches couldn't ignore, pulverization of power via federalist mechanisms of governance, and so on, and so forth. It doesn't matter much if it'd have turned Republican or remained as a Constitutional Monarchy, as the long as the remaining of the list had been adopted and kept running.
Hence, what I'm arguing, basically, is that, in terms of best to worst, we have this hierarchy:
i) Already established Western Liberal societies (case "b") would have remained better in comparison due to already existing, already working, and already having established self-reinforcing mechanisms, to continue doing what they were doing.
ii) A hypothetical Liberal Russia (case "d") would have been the best possible scenario had it happened. Liberal 1950s' Russia would still be behind older Liberal democracies, but way ahead of what Socialist Russia achieved, all without so many deaths and misery.
iii) Actual Socialist Russia (case "a") was bad, but better than a straight continuation of Tzarist Russia would have become.
iv) Lastly, a hypothetical Tzarist Russia that continued into the 1950s would have been the worst possible scenario. It'd have failed to industrialize and would have become a producer of grains and of raw minerals. A small industry would exist, but by and large it'd have turned into an importer of added-value goods, with little hope of turning out better due to an ever-widening gap between its low technological reality and the high technological one of Liberal countries.
Hence, as before, it isn't as much that we're disagreeing, but that we're focusing on different sides of the same issue.
It is a safe bet it would have happened anyway, but it might have taken longer without the propaganda race (...)
True. Probably much longer, but the seeds already existed in the welfare system implemented by Bismarck in Germany in the second half of the 19th century.
Interestingly, Marx himself was intensely opposed to such welfare systems, and argued bitterly against reformist, anti-violent revolution group that departed the then workers' movement to eventually become Social-Democracy. His argument, in his "Critique of the Gotha Program", was that providing such welfare for workers would make proletarians comfortable enough in their lives that it'd defuse their revolutionary spirit, perpetuating Capitalism.
Most ignored this argument until the Russian Revolution happened. Then everyone went back, looked at it with much renewed interest, looked at what Bismarck had done, noticed how the later had shown increases in productivity, noticed how Germany hadn't gone through a Communist revolution despite everyone but the kitchen sink believing the first big one would happen there, put 2+2 together, and began implementing welfare programs all around, which really did dampen that revolutionary spirit and prevented Communist revolutions from popping up everywhere.
Too bad modern Neoliberals, Libertarians and US-style Conservatives seem to have forgotten the lessons of 100 years ago, and are doing all they can to break apart the welfare system. The growing inequality is reigniting that very revolutionary spirit, as wished by Marx. If this idiotic anti-welfare impetus isn't quelched ASAP, the next few decades will see Communism returning in force. After all, what will the dispossed have to lose by embracing it?