I also was having a bit of trouble following your post, but it sounds to me like the "ah-ha" for you is the idea that an object is something separate from its representation - whether that representation be JSON, relational database tables, a Moose object, or a standard Perl object. By turning storage into yet another role, Moose has given you the ability to mentally decouple your notion of "thingness" from its various representations.
However, as BrowserUk hints at, this is not something specific to Moose, or even this application of Moose. Once you have latched onto the idea that the representation is not the "Thing", you are set free in many ways - even from a specific OOP framework (which is itself yet another representation). One thing that has come clear to me over the years is that a very great deal of programming is about representational changes: moving round and round, back and forth from visual image on the screen or browser to representation in program memory to database records and SQL statements to IPC stream to various document formats (XML, PDF, MSWord, RSS feeds, etc, etc) and back again.
Best, beth
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