To understand resistance, it helps to view it as a form of communication, although it can be difficult trying to talk to people who are angry and annoyed, but its informative. If the resistance was seen as a form of feedback, (What) is the resistance saying? Imagine sitting on the other side of the situation, how would the new proposals affect what you are doing.
The thing is, people do not resist change when it’s to their advantage, it’s only when they think it’s to their disadvantage that they become reluctant to comply. Their resistance does not necessarily mean it’s associated with extra work or longer hours but it could be that it contravenes personally held views or they may consider that the proposed ideas will be less effective or that the new practices are just unfair.