How many inches in a mile? Grab a calculator and you'll find it's 63,360, and that's if you remember that there are 5280 feet in a mile.
How many centimeters in a kilometer? Centi = 1/100 and kilo = 1000. There are 100,000 cm in a km.
If you have a container 12"x12"x12", how many quarts does it hold? I had to google it - 29.9 quarts.
If you have a container 10cm x 10cm x 10cm, it's 1,000 cubic centimeters. A thousand cc is one liter.
Some frenchman two hundred years ago got pissed when he miscalculated something that required a dozen different conversions, and decided to make things easier for everyone. But, sure, it's a conspiracy.
Two years ago I moved into my current job. We were doing work in a fifty year old computer system written in Cobol. The software is so old that there isn't a computer that can natively run it any more. It has to be run in a shell on a newer system. Every quarter they would print out hundreds of thousands of pages and an army of specialists would sit at our desks with black and red pens and mark inventory corrections.
Management never replaced the software because it was paid for, even though they were spending thousands of dollars every quarter just on paper, pens, and paperclips. The labor costs are incredible. They finally decided to move to newer software with real-time tracking instead of once-every quarter adjustments. Instead of being a green-screen, text and field data entry with text printouts, the new software is point-and-click with graphs and charts. It's much more capable.
...but...
Moving to the newer software has been a $#!+show. The learning curve on the software is a little steep if you don't have good training, and our trainers are learning the software about as fast as they're having to roll it out. Most of the people I work with have been using the old system for a decade or so, and it took them years to figure out what they're supposed to be doing. Most of them didn't really understand the process they were following, they just knew how to do it. Now they have to throw all that out and learn the new system. Many of them have been fighting to ditch the new system and go back to the old system. That's absolutely not going to happen.
The other day someone asked management with all seriousness if there were going to be pay raises for having to learn new software skills, or for the headaches caused by learning the new system. In my head I'm screaming "It's you're f***ing job!", but then I also realize the labor market is tight, and now's the time to ask for a raise.
That's a long way of saying, you're not stopping the metric system, and if you take the time to learn it you'll be better for it.