If you don't want to make a fuss, then there should be no fuss. There are probably a very few number of people that you REALLY care about knowing your news. The inner most circle. Let them know in your own way.
All the formality of announcements, cards, gifts, etc. Is not for me either. My daughter graduated high school in 2006. She did not want to take part in the ceremony or send out announcements. The same for my son who is graduating this year. I guess it's just that anyone we care about knowing, already knows. Anyone outside that circle, doesn't really matter.
Btw. It takes nothing away from the pride you should feel for your own accomplishment and to share the joy with those closest to you. I say, good work!