Even in the midst of organizational change, it's important to keep your part of the bargain. There will be others who don't. But unless they hinder you in getting your work done, those people aren't your worry. Your concern is to be true to yourself and to do things that, over the long haul, will help.
Management watches, observes, and remembers. When there's a future promotion opportunity or someone is needed for a special project, management will look to those who helped during the change—even if they didn't particularly like what took place. It's in your own best interest to continue to do your work to the best of your abilities.