Moose is good, but the decision about learning it depends on what your goals are.
If you just want to write your own programs using OO techniques, then it could very well be worth diving into Moose (and worrying about other OO techniques later)
If you want to become "a Perl programmer", then you'll encounter more non-Moose OO code then Moose OO code, so you should learn to deal with coding without Moose first. I suggest Object Oriented Perl by Damian Conway as a good starting point.
