You are talking to a biased group here!
I get daily hate mail, and a couple of death threats a year.
There are a few ways that I measure success:
1) Number of people whose comfort-zone I've invaded (in terms of things I've done that they don't approve of, technically)
2) Number of people I've angered because of comfort-zone invasion or because I "moved their cheese."
3) Number of people whom I've angered enough to get them to confront me personally.
I try to get at least two-people into #3 per year. If I don't, then it is because I am not trying hard enough to get people to challenge their perceptions and let go of stupid tradition and habit. I am not asking people to do silly things, just general procedural stuff that exists only because it exists. I like to get rid of that BS and automate it, which pisses a lot of people off, because a lot of people have entire jobs dedicated to manual crap that could be done by a computer.
If I don't piss off several of these people per year then I simply am not doing my job.
Dave is doing his job. But do not misunderstand me: anyone that threatens you is doing so because of a problem that THEY are having, not because of something YOU are doing. If someone threatens you, they are doing so because there is a whole lot of other stuff going on that they can't deal with; it is not indicative of something you're not doing properly.
Dave knows this, I'm sure, but maybe not everyone understands these, so I type it.