I was raised a JW and, similiar to Oompa, I was conditioned that I and my sister and mom "may never die." The Big-A was supposed to come before I finished high school. Now, no longer a JW, for the first time I had to consider my own and my family's mortality. Sometimes, when I'm feeling ill or tired, I can imagine the relief of just going to sleep forever. Other times, when I'm energetic and involved in something that makes me happy, I'm sad to think that life has a time limit. I'm not convinced that there is any kind of existence after death. So far I've resigned myself to think that it's a non-existence like before I was born.
One important thing that has changed since I left the JWs, though, is that I try to be "good" to others now in practical ways, ways that will help them out at the present time, not by preaching some glorious future under the hazy concept of 'the Kingdom.' So I guess my beliefs have changed to a sort of present-day karma thing--help others now, and it will come back to you now--which I feel is basically the 'Golden Rule' that Jesus taught.