I don't think you're being slack at all.
We didn't have a party for Yasin's first birthday - instead we went out to dinner with some friends who have a daughter almost the same age and then took them to the aquarium. Yasin and Hala had a great time - it was at nigt so there weren't many people and they could race around without getting under anybodies feet. We all had a great time without the stress of arranging a party.
I'm a bit funny about birthday parties - I would rather arrange a special something each year (trip to the zoo, go-carting, horse riding, mini-golf etc) than have parties. I think that it makes each birthday more special. My ILs have the same party every year for every family member (same location, same food, same cake) and it seems to me that every birthday is the same. I would rather that my kids remember each birthday seperatley because they did something differant each year. I guess one year we will have a party - just for a change and so that I can hire a bouncy castle.