By what metric?
I can think of a lot of simpler languages. Lua, C, Forth, all the theoretical dead-simple combinator languages you don't want to use (Lambda Calculus, SKI calculus, etc.), etc...
Are all simple, yes. That C is on your list is kind'a the point - Go is explicitly a spiritual derivative of C.
But go down on the TIOBE index[1] and tell me what fraction of languages there are as simple as Go. It's not a large fraction.
[1]: http://www.tiobe.com/index.php/content/paperinfo/tpci/index....
By what metric?
I can think of a lot of simpler languages. Lua, C, Forth, all the theoretical dead-simple combinator languages you don't want to use (Lambda Calculus, SKI calculus, etc.), etc...