Yes you should.
These so called expert accelerators are truly useful in UX since they allow an interface design that is both minimalistic and clean for new users, yet increase efficiency to expert users. Keyboard shortcuts are a great example for this.
Expert accelerators are often 'unseen', meaning you need to delved into this manual or tutorial to learn them, which means they do not clutter the interface.
The general maxim is that new users don't want to learn, since learning means cognitive load and all they want to do is complete the task.
Expert users, on the other hand, often make frequent and repetitive use of the system. For them, the time saved by learning outweighs (sometimes by a large margin, like in the case of Crtl-C) the time learning takes. So accelerators for them are real time savers (as they reduce performance load - either cognitive or physical load).
A good example of the gain/loss principle can be seen in screwdrivers.
If you only screw 8 screws a year, this will do:
You wouldn't go and fork your money for anything else.
But if, like me, you screw around 20 screws a month, this becomes tempting:
The equation is this: It takes roughly a minute to screw a screw with the normal screwdriver; about 5 seconds with the electric one. So I can save myself around 18 minutes a month and around 500 calories, but buying the electric screwdriver. Over a year, I'll save around 3 hours, and I get paid at work for 3 hours more than the electric screwdriver cost. But honestly, when I screw thing I normally just want to get it done.
With 20 screws a month, you are likely to opt for the main-connected ones, since you don't want to charge the battery before each use.
But if you're a mover, and you screw things everyday, this is likely to be your choice:
Since the cable, and having to find a socket will be more annoying than having to charge the battery.