It's worth observing that while text/template may ship with the core code, it's a very, well, library-y library. Get 10 programmers together and ask about text templating and you'll probably get 11 answers. It's very easy to replace it with whatever floats your boat; it's not deeply integrated into anything else, and just ties in to very standard io.Writer interfaces and such.

Bikeshedding about text/template really is just bikeshedding about text/template moreso than Go qua Go.