I tend to only do this as a hobby, but its still pretty standard for me to put 40+ hours a week into making my replicas and props. Despite this essentially being a second job, I still step back after large steps are taken in my process and jump around like a 10 year old opening a shiny new toy. Its not uncommon for me, a 28 year old man, to walk around with a half-finished gun painted primer gray going "PEW PEW PEW" while pointing it at my confused cat.
I'd like to believe that the creators at WETA display this (well, similar) enthusiasm as well with their creations. Is this the case, or sometimes are you just happy to go home on Friday and not look at your work for a couple of days?