I have a GW and yes it is pretty thick by most standards for a knife its size.
Mine is 3/16ths. I think that is as thin as they come. Its a common thickness for a few different knife makers. Striders thinner models are also 3/16ths as well.
What both of these makers have in common in their fixed blades is that they are known for their uses as not only cutting tools but also choppers and pryers.
My Chris Reeve Sable III, my hunting knife, also is 3/16ths so it isn't that uncommon of a thickness for small to medium sized fixed blades. but it is hollow ground.
The thickness of course doesn't make the best slicer, but the edge is much less prone to folding as there is a lot of thickness behind its bevel grind edge, which makes it good standing up against rougher use like chopping and tougher slicing. You aren't going to get a thin slicing edge from a thinner hollow ground blade.
One more thing about the GW that hasn't been mentioned and that is of weight. i've found that compared to many other fixed blades of its size, the GW sure feels a lot heavier.
My GW, smaller than my WP or Chris Reeve outweighs them not sure if the steel is denser, but It could be due to the GW maintaining its blade thickness further down to the edge.
This would make it much much stronger for prying and chopping. The bevel grind is very noticeable and should stand up to some good abuse.
Lastly, the GW is very comfortable to hold as the grip is long enough for your hand (I've found that many smaller fixed blades similar to the GW seem to come with shorter handles) to fit comfortably with room to spare and is thick enough for a firm grip both blade up or down.
I love it and I think you should get one

if its not your thing there are plenty of busse zombies out there that will snatch it up like sweet sweet brain.
If someone can move this over to the busse section I'm sure you will get a load of comments
as for the fatter GWs I think its more of a cool factor as you aren't going to get much more out of a GB prying wise as its stout length can't get you much leverage to begin with.. Doesn't mean I don't want one though hehe. Plus they will gain in weight as well.
Good luck bending a 7" (total) 3/16th piece of infi