show declined meeting on my calendar, so if my plans change I can quickly still see it and change from declined to accept
Agreed on the other points that were made.
We also use calendar events as reminders (such as a person on vacation, a meeting/training that a lot of people will be out for, etc), but even if we are not attending we still need to accept the invitation to be aware. This creates "schedule conflicts" and shows us as busy when really we are available.
Adding a response option to "Decline/Follow" would work well for this issues, i believe
Agreed, this happens to me all the time where I have conflicting meetings, accept one, decline the other but then later on the accepted one is cancelled and I have no record of the previously declined one that I now can attend. If you have two conflicting appointments that are both very relevant you can only attend one but seeing the declined one on your calendar can prompt you to follow-up on it.