Is it worth going to a conference [IEEE UEMCON] to get my undergraduate thesis published? I'm weighing the costs/benefits of going to a conference in New York despite living in Seattle.

My main motivation is that I want the undergraduate thesis I finished earlier this year to be published. In the future I may decide to apply to graduate school and search out opportunities to do research in a different topic.

If I just showed Universities/future job prospects that I was accepted at a conference would it carry as much weight as being a published conference paper?

My reasons for not going basically boil down to:
-Its a big hassle and investment time/money
-The conference could be rather dry
-I want to go but how do I know that I won't just change my mind about it later after already committing?
If you see yourself in an academic setting in the future, this could help you. It's no guarantee, but it is very likely. This is a merit in the academic world. If you are coming from computer science and going into industry right away, and are done with academia, the published paper will not matter. CS people get jobs anyway without much trouble. 

You'd need to try and see this as an investment into your future career IF you want to work in academia. Otherwise it's a cool item on ones resumé, but it won't nessecarily add much after you've gained some work experience which I'd like to guess will carry heavier weight than the paper.