We have been members since July 1998. I say it all the time, one of the best decisions I have made in my life other than marrying my lovely DH...
Our DD is now 22 and has been receiving the DVC benefits since she was 11. Maybe we are a little different than some on the boards. We don't just do WDW with our points. I know, hold the eggs you want to throw at me...but we do HHI, VB,
DCL (10 cruises in 11 years, not bad huh!) and even exchanged out when it was II to Las Vegas, Bay Habor Michigan, New York and Hawaii. On top of the variety of locations and ways we have spent our points we have done WDW more times than I need to count. We love it there and find ourselves taking a relaxing vacation at the World and most folks don't say that after a trip to WDW. We don't do comando style park days anymore and many times don't go to a park at all. I know, crazy by most standards but not according to what seems to be the DVC standard.
I don't think your children will get tired of anything you do as long as you provide variety and age 'appropriateness'(is that a word??) as they grow and change.
I have had more wonderful vacations with my daughter and husband over the past 11 years and honestly look forward to as many more as I can take...did I ever say I love my DVC??