So I have decided to invest a little bit of my free time into melee maps and, wow, making melee maps has changed a LOT from sc1. Rest assured, I know about balance and everything so im good to go.
But I have a problem with symmetry. Is there some kind of option like there was in SC1 where I could get instant symmetry? Or do I have to invest the time into making the map 100% symmetrical? Please help.

http://www.galaxywiki.net/index.php?title=Terraining_Tips#Terrain

Look at the last bullet point. Basically, make half your map and then select it all and flip it.

Also http://us.battle.net/sc2/en/forum/topic/1921697959 has a slightly different method.
And if you like videos, http://www.youtube.com/watch?v=6htlqMDd3-I

I personally find Melee mapping extremely boring. There is very little in the way of what you can do that is unique, and everything just becomes a variation of a theme, on a different tile-set. Different expand locations, different destructible rock locations, different cliff patterns, different high yield locations, different island expansions etc... Very little creativity - but correct me if I'm wrong, I'd quite like to see some custom made melee maps that are good.

Go look on teamliquid, I'm sure they have everything documented O.o