Productivity in Ruby

Personally I've never used Ruby. But Bill Venners' interview with Yukihiro Matsumoto (Ruby creator) still is interesting. The following Yukihiro said could've been my programming motto: "In my point of view, efficiency and productivity are the same thing, because we focus on programming efficiency, not runtime efficiency. I don't care about runtime efficiency. The computer goes faster and faster every year, so I don't really care about performance. Actually, I care about performance when I'm implementing the Ruby interpreter, but not when I'm designing Ruby. The implementer should care about performance, but the designer shouldn't. If you care about performance, you will focus on machines in design instead of on humans. So you shouldn't focus on performance in design."