For us it's not about judging or commenting on what other families are doing, but it's about not being able to move around the parks as freely anymore because of all of the big kids in strollers - in the middle of the summer this makes for an unenjoyable day as I can't count the amount of times my 2 year old has been almost run over by strollers - kids racing strollers - if you're too tired to walk, then you shouldn't be racing! Or, adults running over all of our toes as they try and manipulate too very big kids in those darn double strollers.
This seems to be a very sensitive topic and with good reason. Despite the fact that some of you may think those of us who comment are trying to pass judgment (some may be, I guess), for my hubby and I it's about being altruistic. If my 9 and 10 year old kids being in strollers is going to cause problems for others - which I pretty much always see happening as feet hang out, too big for stroller, parents not being able to manipulate the stroller, arguments about being in the stroller, etc. - then we wouldn't do it, plain and simple. As well, these healthy kids are taking away strollers from the unhealthy kids. In my opinion, if they can't get through the park without a stroller, then something needs to be readjusted in the schedule to accommodate that - I'm sure many adults would want to go in strollers if given the choice, but it's not possible, so it shouldn't be for older kids either, IMHO.
Tiger