Had you asked me with my 1st two kids, I would have said no, we LOVED the trips with them as babies. Both kids first trips were just before they turned 3 months old and they were super easy. Even my first who was high maintenance had a blast there, in part because she was held all day.
Then came my 3rd kid. She hates everything. We took her to DL at 8 months, 10 months, and 14 months. She hated each trip. The 1st 2 trips she wasn't walking yet so wanting to be mobile wasn't a problem, she was just miserable and grouchy the whole time. Wanted to be able to nap in a bed, sleep on time, in her bed, not go on ride after ride, not sit in high chairs at restaurants, etc. I wore her in a wrap most of the time as she was not a big fan of the stroller for those trips either. That made it mildly easier for her to nap, but she was still an unhappy baby.
The last trip was days after she really began walking. She had been able to walk about 6 weeks, but wasn't really interested in doing it much until right before our trip. So the whole trip she wanted to be out of the stroller and walking, out of the wrap and walking, hated the characters, and just generally miserable again. Oh, and the sleep was a huge issue again. No desire to nap or sleep in her stroller, so she was always grouchy and overtired.
We're planning to go to WDW with them in November and I am already dreading it. I hope that she changes by then, but I have little hope.