There is the Beretta 92G which is decock only also. I am a big fan of the 92 series of pistols, but I agree that a safety is not really needed on a gun with such a long trigger pull for the first pull.
I also refuse to consider the GLOCK DAO... it is more like one and a half action, not double action, as the trigger does not FULLY cock the mechanism, and doesn't even MOSTLY cock the mechanism. From the perspective of the user it might as well be single action because most of the cocking is done by the slide and there is no ability to restrike a round or snap cap using the trigger alone because the trigger is incapable of cocking the gun. The only functional difference between the Glock trigger mechanism and a single action mechanism is that by not being fully cocked, a simple release of the pin without the use of the trigger will not set off the round (well, it might actually, but it won't do so as reliably), but this is also accomplished by a hammer block in a single action gun. And perhaps the trigger is slightly heavier, but that's nothing you couldn't accomplish by just shoving a stiffer spring in the works.
The Beretta 92D by comparison is a true double action only pistol in that it completely cocks and releases the hammer. You can restrike with the 92D. For instance, you could put a snap cap in the gun and strike it as many times as you want. With the Glock, or with any single action pistol, it would be, rack, click, eject, insert into mag, repeat.
The main reason the Glock strives for recognition as double action only, is because without that label it would not be able to compete in government contracts. But for all intents and purposes it might as well be single action as far as the actual person holding the gun is concerned. Before the Glock was considered Double Action Only, they liked to call it "safe action" but "safe action" means nothing in a competition between DAO guns to put in the hands of a million government officials.
Call it what you like, it's all semantics and I'm wrong because the Glock Tech says so and he's the guy that defines the words, but the Glock and 92D both carry the "Double action only" label yet are clearly very different. From the users perspective, comparing the manual of arms as a result of trigger design, the Glock and the XD (which is single action) are more apples to apples than comparing the manual of arms between the 92D and the Glock.