Welcome back. I basically have just gotten back into major legoing after a few years as well. viking sets really brought me back, though I have never completely stopped collecting. My work, family and other hobbies kept me pretty busy but now that I have a small child my outings have toned down a bit.
Welcome back! Of all the hobbies you could have lego's is by far not a bad one so I am sure you wife will udnerstand. You could always tell her you wanted to be a great white tamer if not!