Metric is irritating and annoying for certain things. Imperial was created with the mindset to relate to things a lot easier. 1 teaspoon is just 1 damn teaspoon! I don't have to worry about the fraction of a gram or something.
Yeah I don't really get why its a big deal. Converting is easy enough to do. I will say the only annoying conversions ive run into have been using fractions of an inch as they convert to mm. But if you use them alot you can do it rather quickly. Dual systems work great.
Switching to metric would not work. We'd have to change all our speed limit signs, our construction store measurements, every car speedometer, and a lot of other stuff. I'm happy with Farenheit and mileage since that's what I've always gone by. Celsius and kilometers are kind of confusing for me.
I dont want it in cars or on the road though ... Then we all will have to drive slower. All the nice round numbers for kph involve rounding down from an equal conversion from mph. (ie. 25mph = 40.233 so youd actually go 40kph. 70mph = 112.654 closer to 110 ... Theyd probably make us go 110kph in a 70 zone. Even just seeing 110 on a sign at all seems crazy.)
I am a fan of mm for sockets though. Always handy to have metric around when a bolt head that used to be standard wears a bit and a metric fits nicely. Its like having all your half sizes right there too.