Craig,
My hat's off to you. Missing out on going to WDW for such a long time is really depressing. You're doing it for a great reason, though. WDW is about families, and you're putting yours first. That's just great. Quit feeling bad about feeling bad and pat yourself on the back a little--you deserve it.
FWIW, I'm on the opposite end. Our trip in Dec will probably be the last with our children. My daughter's will be a soph in high school next year, and there are other places we really need to go in the next few years. I just don't see us getting back to WDW before she's out of school. I know my wife and I will have trips in the future, but I don't see how it will be the same without our "little ones."
Take care and remember the Disboards are the next best thing to visiting WDW (cheap, too!).