I just find it SOOO frustrating. It's such a huge step back for women in general, and I think it's a very poor choice for newlyweds to make. Even if you've been living with the person (like my SIL), being married is a much different story on many levels (financially, emotionally, etc.)
I think I would feel much differently if my friends had waited two years to get pregnant, you know? I think I wouldn't feel so much like babies are the be-all and end-all.
At least we have two sets of friends (possibly three, I don't know my friend K's plan) who have passed that one-year mark without getting pregnant. In fact, one set of friends has been married about 7 years now, and they want kids but are still waiting. I feel like when they DO get pregnant, I can be genuinely happy for them.