GDRs are in no way overpowered when compared to nukes. If you have the means to build GDRs, you have the means to spam nukes, even moreso atomic bombs. And there is literally no way to stop these, while you can always kill a GDR with ranged units, and suffer no casualties.
Every GDR you build is one less atomic bomb slot for you. And once you are filthy rich, a constant rain of nukes (which come earlier!) is way more devastating and one sided than two GDRs can ever be. The only advantage GDRs have is that they are cleaner, but you really don't care then, since the game is about to finish.
IMHO, atomic weapons need balancing before GDRs, should GDRs really need it, which I don't think: they come late and they are extremely expensive, while 1dmg/attack ensures that they won't last long if your enemy has rocket artillery, or even destroyers, in range.
For the initial question, I do use them, but they very rarely make a difference. Nukes do. They actually "improve" the late game balance.