I'm 99% sure you do not need the course if you fly IFR.
I had been flying it for years before I took the course, when I did

I realized I couple things IFR pilots should just be aware of.
If you don't take that short course, fly IFR and for example, call Leesburg in site for a visual .....and didn't understand squawking 1200 is not allowed, you may get I surprise!