Just so we're clear; the "Galaxy" Editor is the standard editor that came with the game right? Because my game simply labels it "StarCraft II Editor". If so, I bloody well hate it so far. Okay, no, I don't, but it's a real nuissance to learn, though having some experience with WarCraft III's World Editor helps.
At least melee maps aren't difficult to make.
With any luck I'll have made something worth playing soon. Truth be told; I like it enough to continue struggling through it's rookie-hostile interface, lol.
I've seen a fair few interesting creations made with it, and I'd really like to find out how the pros do some of the stuff they've created. Even transferring the Reaper's cliff-jump ability to another unit is ludicrously tricky.