Originally Posted by Alltimegreat1
US citizens can stay in EU countries for up to three months as well.
Would a US citizen be at any disadvantage compared to a German citizen when it comes to relocating to Poland (for example)?
One catch is that some countries allow you to change your visa/residence status while already in the country on a "tourist" visa (the 90 day thing) while others won't. For some countries (like France) you can only apply for a long stay (i.e. over 90 days) visa at a French consulate, which is by definition outside France. And you must enter France on or after the date your visa becomes valid.
As far as establishing yourself in Poland, you're basically in the situation where a German citizen has the "right" to move there without a visa, whereas a US citizen doesn't. If you're referring to trying to find a job in Poland, you won't have the right to work in Poland until you have found a job there and your employer does whatever is necessary to clear the way for getting you a work visa. (Varies by country.)
The other "disadvantage" would potentially be the linguistic one. If you're trying to live in a country, it's not particularly easy to get by on a day to day basis without a reasonable acquaintance with the local language.