Your Time Is More Important Than Anyone Else’s

I don't mean this literally. I am sure there are many people whose time is more valuable than mine. The President of the United States. The Pope. JK Rowling. Well, maybe not the Pope.
My point is that most people do not value their time in the way that I value my time. They are not trying to fit three times as many things into a day as any normal person. They may be happy with fitting in half the things in their day that a normal person does. A lot of these people are on committees that want me to help them because I work efficiently. Well, the first rule of working efficiently is never attend committee meetings because I suspect no one in a committee meeting values their time. There are simply a thousand better ways to use everyone's time more efficiently than a committee meeting, in my experience. And I guess it doesn't make me a super popular person to say this out loud to anyone on the committee. So I have to come up with excuses. Or come late. Or leave early.
I am not trying to say that other people are stupid and that everyone should live their lives like I live mine. I recognize that I am probably a bit obsessed with efficiency. But it IS how I get so many things done in my life, mental illness or not. And not being driven to use time efficiently is why other people don't get as much done.
So if I find someone who uses time efficiently, I tend to value that person's time as much as my own. If I am going to my current doctor's office, I show up on time because he tends to make sure his office is run efficiently and he almost always calls me in within 2 minutes of when I arrive. The same thing with my dentist. When my oldest daughter had her first music teacher, the woman insisted that we show up on time and that we pay her if we forgot to show up at all. She didn't want her time wasted, and she made us pay when we didn't. Guess what happened? We were always on time for her lessons and we never blew them off (except the first time, when she chewed my ear off and demanded I pay her anyway).
I don't want to spend a lot of time chit-chatting with people when I have business to get done. I want to get the business done. And there are ways that you can subtly (and not so subtly) impress this on the people around you. You simply cut off the small talk and say, "So, let's move on to why we're here today." You write up an agenda and you move quickly through it. You treat people as if they are intelligent and don't need their hands held through simple tasks. You write things up in advance and send them around to people so no one has to waste time reading something. (I read quickly, so I can be easily annoyed by the time it takes others to read.)
And finally, make sure that if you are going to run an errand where you know your time will be wasted (the DMV, for instance, or the bank), you bring something to do with you. This communicates to other people that you are busy and that you don't need to sit around waiting in order to find things valuable to do with your time. It may not be the most efficient use of your time if it's noisy, but you can at least read a book or do something else that you would likely have to get done anyway.