That's funny, given that what else you said in this thread is only slightly truncated at:
If I never have to write an accessor generator by hand again, great!
I use Moose for anything with more than one object attribute.
Otherwise, your question is obviously just rhetorical since I don't know what you do or don't do when you design. Though, certainly, one should take a self review of design prowess with a grain of salt.
I also never claim that using Moose makes good OO design impossible. If you can fight the tendency that I pointed out, then good for you. Though, it doesn't really sound like it, even just in this thread. :)