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A Joule is a measure of work energy. It is about equal to the kinetic energy of an apple dropped from a height of 1 meter as it hits the ground. A human being radiates about 60 joules per second of heat energy.
A Joule is equivalent to 1 watt for 1 second, or a watt-second. A watt-second uses the same units as the kilowatt-hours on your electricity bill, and the power company could just as easily bill you in Joules as in kWh. If you use 1 kWh then you've used enough energy to light a 100W lightbulb for about 10 hours, or about 3.6 million Joules, or enough to get my car about 3.3 miles down the road.
Yes, it has been a slow shift, now that you mention it.