I don’t think anyone forgets, I just think most people don’t take these things that personally and approach any replacement attraction as a new thing to be taken on it’s own.
While I understand that these parks have a lot of personal memories attached, there is a pocket of the fandom who seem to hold a grudge and get mad when others don’t. A lot of us have figured out that we can and will be sad about some things but that we ultimately have to move on because it’s out of our control.
We are not the villain here because we don’t want to hold a grudge against a theme park for taking an attraction out. In most cases, we feel just as sad as anyone else, but we choose not to hold onto that forever and ever and let it become some snowballing thing that turns us negative against anything and everything to do with the parks.
Things change, they come and they go, and part of being interested in an industry like this is learning to make peace with it. Some of us have made that peace, and some haven’t, but it’s not fair for those who haven’t to lay their frustrations at the feet of those of us who have. It isn’t our job to punish Disney and it isn’t our fault they make the decisions they do. Nothing we do is going to change how Disney operates.