I tend to binge when it comes to gaming. I'll spend 48 hours on a game of Civ or something and then I don't touch it for another 6 months. I think that keeps old games from feeling stale.
I tried Civ V when it first came out but didn't like it, I heard that it got a lot better after the expansions and updates, but I don't feel like investing more money into something that I already found disappointing (Same exact story for Total War: Rome II). I've never tried Europa Universalis, but hear good things about it.