Your Disney trips with your parents sound great. It sounds like you have it down to a science.
I could be wrong, but I don't think you're going to get your wish concerning the airport experience dampening your kids enthusiasm for flying. At least, that's not the effect flying has had on our kids. Even though they've experienced flight delays, cancellations, full-blown security checks, turbulence, and even dragging their own luggage from one end of the Atlanta airport to the other in the middle of the night, they still think traveling by plane is pretty cool.
Thank you for sharing your experience about taking your MIL along with you on vacation. That's helpful. It is something we might do, taking my mother, when she's ready to do it. For now, she's too newly widowed. I just talked to her last night (we only talk about once a month). She's doing as well as can be expected but not ready to "go out and play". She did just go back to work (part/time) a couple weeks ago.
On another subject, I'm wanting to go on a shorter
Disney cruise in September with my husband. The first time dh and I decided we wanted to go on a cruise just the two of us was for our 10th anniversary. Well, that was on December 31, 1999, and dh was convinced there was going to be a Y2K disaster. That plan was scrapped. The next time we started planning we got as far as deciding on an itinerary, and I was about to book it, when we wound up admitting to each other that we really didn't want to take our
first ever cruise without the kids. (We really like traveling with them.) Although I didn't know anything about
DCL, I knew that cruiselines had children's programs. My research led me to DCL and we agreed it was the best compromise. The rest is a story that you've heard a million times. We're hooked. Anyway, since we have no vacation plans this year and since my mom (who lives 2 hours from Cape Canaveral) would love to have the kids visit her, I think the timing is right for a parents-only cruise.