I haven't been here long, but I thought building roads to improved resources was a no-brainer. It's easier to get a one-MP unit out to where enemies appear. If something happens to an improved resource, either from special events or enemy pillaging, it's quicker to get out there and fix it. Plus, a road is one more thing the AI can't resist pillaging, so if you're stretched thin, it'll buy your other improvements some time. I'm starting to realize that some of the other things I do are "bad habits," though. I never build just one worker-- I build a stack of four, because I want my tiles improved NOW!! I also had an aversion to slavery, but when I got BTS a month ago, I got over it.