TBH I'm not sure what all the fuss is about. From what I've heard many ordinary Germans aren't really that bothered and can see the sense of moving the troops east. It won't be such a good gig for the soldiers though - the nightlife in Poland is a shadow of that in Germany.
Regarding the wider debate about the US's role in NATO, the likes of Ramstein plays a role in the US's wider ops beyond Europe (i.e. in the ME or Africa) from a logistics/medevac etc perspective. It would be a long ol' haul to tank fighters etc non-stop to/from the US or to evacuate critical casualties back to the US, for example. Also, there must be considerable lobbying pressure from the big US defence companies, who benefit handsomely from all those multilateral defence programmes with major European participation (F35, P8 etc).