The Ga-Ga Gun

 August 1964

Owlman uses his Illumina-Gun in "Crisis on Earth Three" (Justice League of America #29)

April 1967

The Owl uses his Owl-Gun in Dell Comics' The Owl #1.

September 1967

Dr. Mid-Nite uses his Cyrotuber in "Crisis Between Earth 1 and Earth 2" (Justice League of America #47).

The Ga-Ga Gun (or its equivalent) was quite simply an idea whose time clearly had come.  But has it gone?  I have never seen repeated uses of such a device.  

I must agree with the assessment that Dr. Mid-Nite's blackout bombs were a threadworn device, even in the '60s.  I find Dr. Mid-Nite more interesting when the character's uniqueness in being a brilliant physician is relied upon narratively more than his uniqueness as a (daytime) blind person.  Giving him a a wider variety of weapons based on his knowledge of this weaknesses of the human body seems like it would keep the character much more interesting in a contemporary context.