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I was not here back in 2008… I can say a bit about how I see the current progress.

I think the UMP project is the most important source of data currently. It’s focused on producing maps for navigation, so their road network is much more complete than of OSM. They have a lot more interesting data, though - that means forests or rivers, for example. You can see their data at http://mapa.ump.waw.pl/

You asked about the consequences - the most visible one, at least for me, is the existence of dense rectangles of roads in some parts of Poland, cut along the edges of UMP regions. Their data is sometimes inaccurate - they use a different road classification system, so ideally, the data imported should be reviewed carefully. Probably because of that, some people don’t want their areas to be imported from UMP.

I think using OSM data has little point so far, as the map is far from complete. There are spots of order in the areas of mappers activity, but the rest of the map isn’t really usable, because of the incomplete road network and the village names being outdated. Maybe that will change in the future, but there’s a lot to do yet. Therefore I doubt any officials are using the data. If I were one of them, I’d rather use UMP, if any.