I too used to never miss an opener. I've sit in a tree in some NASTY weather.
For me, I haven't necessarily become more of a slacker, but rather I've become busier. Work has become more hectic and the family life is more involved. Finding time to hunt was a lot easier when I was single. Don't get me wrong, I wouldn't change a thing, it's just something that you have to adjust to as you grow older and start becoming an adult. My hope is that once the kids get older, they'll be able to join me in the woods and I can start increasing my hours in the woods.