This is true currently but both the inlining and the garbage collector have improved tremendously over the past year and should continue to get better.

I do wish Go supported an explicit inline modifier that worked like haxe's though (unlike the C/C++ one which is more of a suggestion).

Most C dialects (for example, GCC and Clang) provide some form of explicit inline qualifier that forces inlining, for example "attribute((always_inline))".