I'm not sure if German reunification can be considered as symptomatic for integration of the former East Bloc to capitalist Europe. I used to like the idea of Germany being a sort of microcosm of the divided world, but I think that's oversimplifying things. The reason reunification has been so costly is that it was handled in a stupid and arrogant manner by former West Germany. Essentially, they approached it with the attitude that everything that East Germany did was wrong, and should thus be wiped away. The consequence was the complete dismantling of East German economy, including many industries that existed before the partition, and a state of desolation that left many people with no option but emigrate to western Germany if they did not want to face unemployment at home. All this has proven too much even for the West to handle, so that you can now by no means use a blanket statement saying that the west is rich and the east is poor. Saxony and Thuringia are not doing much worse than Rhineland-Palatinate or Northrhine-Westphalia, the traditional powerhouse of Germany.
In the same way, each country has handled the fall of Communism differently. Hungary was quick to introduce turbo-capitalism only to run out of steam and experience a miserable fall. Slovakia was desolate at first but is doing pretty well now. You can tell that a place like Estonia, Slovenia, or Slovakia has profited very much from European integration, and thus love the EU, while others in the west, such as Spain or Ireland, were major recipients of European benefits in a more distant past and now end up hating it very much. Still others like The Netherlands or Finland have always been doing well, and have first-world issues with the EU at best.
My point is, I guess, that the EU suffers a lot from its inherent heterogeneity. The motto 'United in Diversity' is unfortunately nowhere close to being realised. There is a lack of vision for an European future that can be transmitted to the average European. Many Germans for instance believe they would be much better off without the EU, and that the EU is limiting the country's economic power. In essence, they believe Germany could face China and the US on its own, but the EU as a whole can't. It is also becoming increasingly difficult to argue why German taxpayers should bail out Greek banks while at home, there is not enough money to keep commuter trains running.