I will also continue to argue that, while the imperial system seems great for those who grew up with it, it's actually not as good for most things in day-to-day life when you look closer.
For example, measuring things in Fahrenheit seems to make sense, but the Celsius scale is just as good for measuring weather, as well as other practical applications. In Celsius, 0-100 degrees is exactly the range of temperatures in which water is liquid at normal pressure, which has all kinds of important applications both in your kitchen, and outside of it. And I know, it's not the range of comfortable temperature: that would be 0C to 30C (32 to 86 F); anything outside of that range is very uncomfortable although people frequently have no other option but to put up with it. In Fahrenheit, the range of liquid water translates into 32 to 212. That seems stupid and arbitrary by comparison. Also, if you measure only in 1 degree increments, Celsius degrees are equally good, since even supporters of the Fahrenheit scales acknowledge that they can't tell the difference between 69 degrees and 70 degrees anyway, and that's because humidity has a huge effect on our perception of temperature.
But similarly, the length of feet and yards are pretty irrelevant for measuring spaces. Being an average-sized Caucasian man, my foot is barely 10.5 inches long, for example. If I want to measure the size of a room, I can put one foot in front of the other and walk, counting my footstep, have an totally unacceptable error of 14%: I said the room was 16 ft long, and it's actually 14 ft. In the end, I have made a pretty bad approximation. And if I'm a woman, child, or even man of almost all other races, that error becomes much, much larger. Measuring a person's height in feet also gives a range with pretty useless resolution if you round: "she was between 5 and 6 feet, your Honor" (she's actually 5' 6"). With decimeters, a perfectly valid metric unit, the range of 5 to 7 feet becomes 15 to 21 giving you better resolution. Now the woman measures between 16 and 17 decimeters or, for you, 5' 3" and 5' 7", a much better approximation. (And converting back and forth between decimeters and meters or centimeters is beyond trivial).
I know some people won't quite get my point, or they'll say, "But imperial is so much easier because I don't need to learn it!" Really though, imperial only seems easier because you have not been exposed to it in everyday life. If you had been exposed to both as I have you would realize how ridiculous that is. On a day to day level, the perceived advantages of imperial are just a matter of familiarity, and being able to do the math in your head even for trivial things becomes a pleasure that can only be enjoyed if the math is simple.