It was definitely worth it for us (3 Adults) in October. We saved about $450 over the cost of the Dining Plan. We have been to WDW many times so we no longer do the parks "Commando" style. We also enjoy a sit down meal each evening.
I see 2 things from your signature. It says your honeymoon is in April 2006, and it is your first trip to WDW. Have you made ADR's (Advanced Dining Reservations) for TS restaurants already? If not, it is very likely that you will find yourselves being turned away from TS in the parks and the popular ones at the resorts. People are able to make ADR's 180 days in advance and the popular restaurants are booked and turning away walkups without reservations. The Dining Plan has made the TS restaurants far busy than in the past. Many folks are enjoying restaurants they might otherwise not have gone to. If you can not eat a TS meal each day, I do not think the Dining Plan is a good deal for you.
Also, it is your first visit to WDW. In my experience most TS meals take about an hour to an hour and a half. Do you want to take that much time out of your park tourning time?
Just a couple of things to consider.
Take a look at the menus here on the DIS or at allearsnet.com to see the foods offered and the prices of the meals. This may help you decide too.
Good Luck and Congratulations on your upcoming wedding.