Having a talk with Galaxy Editor seems fun
Unfortunately, Blizzard made the Galaxy Editor fill in their missing jobs in Wc3's Editor like a native for local multiboards, custom UI and such..
Plus, I already tried modding Sc2 since I have a free sc2 from beta (cool isn't?)
What I don't like is you still need to log-in your freaking BNet account just to open that Galaxy Editor.. Oh damn.. even though you may search google to avoid that annoying log in screen
But in case of terrain, shading is awesome o.o
In triggers, well its just somewhat like JNGP wherein you may add things like LUA or something plus a more gui function.. still, to fill in the missing parts Blizzard missed in wc3 editor.
Well if you want your mod to be compatible with old PCs which have at least 512mb ram, 64mb internal video card, Pentium IV 2.44GHz CPU, Windows XP, use wc3