Yeah, I just switched from my $30 plan to a family plan and now I only have 1GB/month so I'm going to have to seriously manage my data. Fortunately I think I'll be fine. I'll download podcasts over WiFi, handle photo/video auto uploads to Dropbox/Google+ over WiFi, and after those the next biggest data users for me was rdio and Play music. I don't think I'll have a problem staying under 1GB, strangely.
_________________________
Matt