We are at the airport now (for a connection) and although there are better seats available, United does not do anything nice for newly weds. In fact, they didn't even say congratulations when I said we were on our honeymoon! They just said, yup there are seats, you'll have to pay more for them.
When my sister was on her honeymoon 4 years ago, she got some complementary cocktails - she flew Southwest, so they don't really have 1st class.
So is special treatment for honeymooners a thing of the past?