Well, I guess I would draw a line between a vacation WITH the kids and WITHOUT the kids. We have a terrible time getting excited about taking the kids to Yellowstone, Mt. Rushmore, Yosemite, Grand Canyon, Washington D.C., etc., etc. Which is really a shame. Those were the trips we took in our youth, but now our kids compare it to WDW. Can't blame them, but I wish they would want a change of pace and appreciate our natural wonders, history, etc. But.....we always seem to end up at WDW.
Now WITHOUT kids, we have a wonderful time in Vegas, New Orleans, Chicago, etc. But these are generally 2-4 day trips. We have just as much fun (sometimes more) on these trips compared to WDW. But that's why I separate the two, they're different experiences.