Copying Oracle user without dump file
Steve is discussing how to copy a user and that user's grants from one database to another.  That wouldn't copy the objects the user owns or the data in those objects.

Why don't you want to use the export and import utilities?  Whatever restrictions you have that prevent the use of export and import might prevent you from using other alternatives.  You could potentially copy the data over a database link, for example, but that wouldn't generally be preferred to just using export and import.  If you want to do this on an ongoing basis, Oracle provides various tools for replicating data-- Streams, materialized views, etc.