Somewhere on this site or maybe on a personal blog somewhere, I have stories about taking nearly my entire corporate job back in the early 1990s and secretly reducing it down to a single macro. Efficiency has always been a particular fascination of mine and, no matter how many new clients I get, I've never encountered a client that couldn't benefit from efficiency improvements. As a field of specialty, this type of thing was a pretty big deal in the 1990s, with entire management companies springing up to address this issue. It's seemed to have waned a bit, since then, for various reasons. But, I think, in general, efficiency is probably worth revisiting now for many of the same reasons it was back then.