This thread is great! I'll admit there are times when I want to scrapbook when I should be doing other things. But, overall, my family isn't suffering because of this hobby. I cook dinner, I play with my kids, the laundry gets done (just not folded - lol).
I recently had a friend tell me that when she sees my pages on FB, it makes her feel bad because she doesn't scrapbook. I had to laugh because this is a girl who is VERY involved in a lot of things. She has a successful photography business and a regular spot on a local tv program, etc., etc., etc. So my response to her comment was to kind of laugh and tell her that she does plenty of things that I don't do and she doesn't need to feel guilty about not scrapping. And, then she said, "Yeah. But, what you do MATTERS."
So, just remember that. Yeah - it's a hobby. It can be time consuming. But, in the end, you are preserving memories for you and your family. And, that matters.