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Try

rosrun urg_node getID /dev/ttyUSB0

If you have a look at the CMakeLists for the new package(urg_node), it should show you the new names wherever used.

The documentation for urg_node hasn't yet been updated I guess. It is almost still the same as the documentation for the older hokuyo_node package.

For the latter part of the question - I doubt that it really makes much of a difference as long as set it to the right device at initialization. You might want to have a look at this - ofcourse not on the same package anymore http://answers.ros.org/question/45850/problem-running-hokuyo_node/