I am in microbiology/molecular biology, but in a narrow, applied field. At the conference I went to, there were many talks from semi-related fields that I got lost in, but at the same time managed to learn a lot too. If you are familiar with your area already and can afford to go, by all means go. I don't think it is possible for attending a conference to do you any harm - unless you meet someone on the brink of publishing your exact project!
And Rome is such a great city! I would go just for Rome.