Just watched it last night.

Me too.
IMO, it's a fantastic movie, that runs much deeper than many realize.
It's a lot more than just a comedy, it has a lot of messages running underneath it. It is a thoughtful, well written and crafted script that you simply never (or rarely) see in the movies anymore these days.
I'm actually not a big Bill Murray fan, but he was so perfect in Groundhog Day.

Some movies, you watch it once, it was entertaining, you move on.
Some movies you go back and watch many times to see the layers of artwork or messages: A Clockwork Orange (NSFW!!!) was brilliantly done. So many layers, double meanings... I never tired of seeing it. Too bad it is so unwholesome that I just won't watch it any more.