The Go GC with 1.5+ (and especially the work going on currently for 1.7) makes it all but unnoticeable for the majority of non-soft realtime (think HFT) systems:
For 99% of users, it is simply not noticeable anymore. Also note that I've worked at said HFT nanosecond latency types of firms the past 9 or so years.
They are still way cheaper than GC pauses in Go.