msilverstone1 - I'm not sure if you are referencing posters on here who don't seem to understand when most of us travel to WDW with children and therefore absolutely know how inconvenient parking strollers is at times, but we also know that it is necessary to the system. If you are referencing people in public places who feel the need to make rude comments, don't mind them! These are the same people who frequently make spectacles of themselves while in WDW because they need to get somewhere right away, the same people who use curse words in front of my daughter, and the same people who walk around WDW with huge coolers or bags that knock into my daughter's stroller, my hips, my feet, etc. You need to do whatever is safest for your daughter, whether it be a carrier, harness or stroller.
My daughter was 10 months old for her first trip, and has trip #4 in July - 4 times in 2 years, so we definitely have lots of experience in this area. Backpack carrier (sorry, I forgot to mention it in my original post), stroller, harness, toys for lines, lots of breaks, well fed, well rested, etc. The fact is though, that all children have different temperments and personalities - my DD can wait in line and doesn't run off in crowds, whereas your DD based on your posts, does not; therefore, the Disney cueing system, stroller storage, etc. may not work for your daughter (I can't tell from your post if you have already been to WDW, or have a trip coming up) and so it may require you to be creative with how to keep her comfortable while in WDW. The fact remains, that millions of families travel to WDW each year and we are all forced to work the system, some successfully, and some not so successfully. Only you know if your DD can handle the constraints within WDW as they are there for safety, space limitations and keeping things running smoothly.
I do wish you luck, and do understand your frustration as I have a very active 3 year old myself who has been able to work the Disney way of doing things, although not always (sometimes the 95 degree weather in July makes her do things she wouldn't normally do - LOL!), and so we do our best to make sure that she is as comfortable as the Disney system will allow.
Good luck with the carrier. Happy travels, Tiger