I work for the Electronic Frontier Foundation. We switched to CiviCRM so that we could be sure that our membership data stays safe, secure, and private. Now we have control over our CRM and can customize it to work for our needs.
We work with non-profits to help them use and understand Civi. It's such an important tool for these organisations and it's great to see people using it in different and interesting ways. Using and working with Civi is made so much more fun and useful by the enthusiastic and talented community surrounding it.
I find the engagement with our community of users to be intellectually stimulating
and rewarding. Seeing folks with expertise in a particular area step up and contribute their time and ideas to help improve the product is quite exciting. Every time I hear about a new interesting organization starting to use CiviCRM, I get a renewed sense of excitement about our work. The range of civic sector organizations currently using the software is quite amazing to me - from large international advocacy organizations to local performing arts troupes. I also really enjoy interacting with our international community - building friendships and getting to share culture (food, music, humor ....) with colleagues on every continent.