flashn00b: I've only noticed the lack of GOG downloader when i tried to install the Destroy All Humans Demo. Even with the offline installer, the demo still requires Galaxy anyways as it opens up the client to run the game, rather than just simply running the game like with GOG games back when the Downloader was still around.
As I have mentioned elsewhere in this thread, IF you have Galaxy installed it will auto-add to Galaxy any GOG game installed though offline installers. Even if you have installed said game to a separate install location than all other GOG games, it will still be added to Galaxy, and often (usually but not every game) it will open Galaxy when you go to load the game.
I found this out with another game I have, and I also thought at the time it required Galaxy. BUT if you uninstall Galaxy the game works fine. And if you reinstall Galaxy, Galaxy won't open again automatically when you go to run that game.
The only way it seems to keep Galaxy from "taking over" when you install a GOG game, is to not have Galaxy installed at all. This is certainly not behavior one would have expected considering Galaxy has a option to "add" games, why put that in if they are always added? Although, I suppose if you want to add them AFTER you install Galaxy, that option would be handy. Still, it leads one to assume games won't be auto added and load Galaxy by default when you install a offline installer. An assumption that has proven to be incorrect.
Also as I have said before, I'm not saying there is anything malicious going on, but it is a little spooky when a program does something like this behind your back. Especially for people that like to know everything their machine is doing and watch closely.