I was with my mom and DD two years ago, and I can relate to your experiences. This year, I'm going just with my mom (now 77). It's her I have in mind when I think about traveling between ADRs and FPs, for example, and I'm spending a lot of time visualizing how I'll handle it if "x" or "y" happens.
This time she will be in a wheelchair, and I will be maneuvering it. So I need to be prepared to let the tide wash over us, so to speak, while she is seated, but I may need to be more defensive when she is walking (she can manage short distances for shopping, for example, but only with a cane).
The behavior described here is real, and it is absolutely as intimidating for the elderly as well as the very young.