I was very concerned about taking our 4 and a half year old for the first time. I really worried about it, wondering if we should be renting a stroller for her. We had a 5 day pass, and spent almost every waking moment there until around 8:30 PM. We walked, and walked, and walked. (we had decided not to rent a stroller, and play it by ear.)
*I* suffered FAR more than she did.

She was fine. Wiped out by the time she went to bed, but never complained about walking around, not once.
She was a heckuva lot stronger than I was.
Seriously, I'm
not joking. I recall getting horrible blisters on the bottom of my feet and having horrible, horrible foot and knee pain. I also had shin splints after a few days in. I remember sitting down in the PotC ride, and suddenly, within a minute or two, the pain in my feet was so much that I had tears in my eyes. I will never forget that pain. I've got crohn's disease/arthritis (auto-immune disorders that can cause flare ups) so maybe that's what did me in. However, I am around a size 16-18 for clothes, and am not in very good shape to be walking around, so I should have been in better shape before walking around, standing in lines, etc. Usually it's the standing in lines that really hurts a person.
We've been there 2 more times since then, when she was 5 and a half and then almost 6 and a half, and each time she did great without a stroller. Last time we stayed further away [at the HOJO, which isn't a far walk, it was fine] and this time I had help from everyone on the boards; I took their advice and took ADVIL (ibuprofren) on a reg. basis throughout the day, and it helped *So* much!! I also rotated a couple of pairs of shoes, and I still got a couple of small blisters, BUT my legs and feet were absolutely fine! I couldn't believe the diff. taking an anti-inflammatory worked! It was awesome!
Anyway, I just wanted to let you know, OP, if your child is normally fine to walk/run and has no special needs, you likely won't need it for her. I have no problem with anyone using a stroller for any reason they see fit. Special needs or not, it's anyone's personal decision to use a stroller if they so wish to do so. I just wanted the OP to know that her concern may be for naught.
Edited to add: The 3rd trip to DL, as I said, I had no pain in my feet or knees thanks to the advil - but I had caught a horrible flu like cold the second day into the trip. ARGH!!! But Disneyland is STILL the happiest place on earth.
